Turn a Blind Eye

"Turn a blind eye" means to deliberately ignore something you know to be wrong, or to pretend not to notice an inconvenient fact or situation. It implies a conscious choice to overlook rather than genuine ignorance. This phrase has one of the most precisely documented origins in English idiom history, rooted in a specific moment from the Napoleonic Wars.

How to Use This Page

Read the history section for the well-documented naval origin of this phrase, connected to Admiral Horatio Nelson at the Battle of Copenhagen. The modern usage section shows how it is used today. The similar phrases section covers related idioms for deliberate ignorance.

The History

The origin of "turn a blind eye" is almost certainly connected to Admiral Horatio Nelson at the Battle of Copenhagen in April 1801, and it is one of the most credible and colourful phrase origins in English.

During the battle, Nelson was serving under Admiral Sir Hyde Parker, who at a critical moment signalled for the fleet to disengage and withdraw. Nelson had lost the sight in his right eye at the Siege of Calvi in 1794. According to the well-known account, when his flag captain Thomas Hardy pointed out the signal to withdraw, Nelson raised his telescope to his blind right eye and declared he could not see the signal. He continued pressing the attack, and the British won a decisive victory.

The earliest written accounts of this incident appear in biographies and histories written shortly after Nelson's death at Trafalgar in 1805. The phrase "turn a blind eye" began appearing in English writing from the early nineteenth century, and the connection to Nelson was widely understood at the time.

Whether Nelson actually said the exact words attributed to him or whether the telescope story has been embellished over time is debated by historians. However, the incident was contemporary and widely reported, and it gave the language a vivid, well-anchored idiom for deliberate wilful ignorance. The meaning has remained stable ever since: to choose not to see what you do not want to acknowledge.

How It Is Used Today

In everyday speech: "The landlord turned a blind eye to the noise complaints for years."

In professional and regulatory contexts: "The regulator was accused of turning a blind eye to the firm's conduct during the years before the scandal broke."

In politics: "Successive governments turned a blind eye to the problem rather than tackle its root causes."

Similar Phrases

"Look the other way" is a close synonym, implying a deliberate choice to avoid observing something. "Wilful blindness" is the legal and formal term for the same concept: deliberately avoiding knowledge of facts to avoid responsibility. "Ignore" is the plain equivalent, though without the implication of conscious choice. "Sweep under the carpet" implies not just ignoring but actively concealing.

Frequently Asked Questions

Did Nelson definitely use his blind eye at Copenhagen? The incident is well-documented in contemporary accounts and considered historically credible. The exact words Nelson used vary between sources, but the core action, raising the telescope to his sightless eye, is accepted by most historians as having occurred.

Does the phrase imply wrongdoing? Not necessarily. It often implies tolerating something questionable, but it can also describe choosing not to notice minor infractions or letting something pass without comment. The degree of wrongdoing being ignored varies by context.

Is "turn a blind eye" the same as "wilful blindness" in law? They describe the same concept but in different registers. "Wilful blindness" is a legal doctrine used in criminal and civil law, where a person is held liable if they deliberately avoided learning facts that would have established guilt. "Turn a blind eye" is the everyday idiomatic equivalent.

Is the phrase more common in British English? The phrase is used across all major English-speaking regions. Given its British military origin, it has a particularly long history in British English, but it is fully established in American, Australian, and Canadian English as well.

What the record actually shows

The page above tells the Nelson story, which is the account most readers meet first. The dated record behind the phrase is longer than the story, and it starts more than a century before the Battle of Copenhagen.

Two conclusions follow from the dates. The phrase in its longer form is older than the battle, and the shortened form is documented in print after it. Nelson did not say "turn a blind eye", and no source claims he did.

The two halves of the story

The idiom and the anecdote are separate things that later joined.

The first half is the phrase. John Norris, a Church of England clergyman and philosopher, paired the deaf ear with the blind eye in a 1698 sermon on walking by faith. The image is one of deliberate refusal to take in the world, and it carries the modern sense already: the eye is turned away by choice. Francis Lathom used a shortened version in a novel in 1800, a year before Copenhagen.

The second half is the battle. On 2 April 1801 Nelson was second in command to Admiral Sir Hyde Parker, who flew the signal for the fleet to disengage. According to the account in Clarke and M'Arthur's biography of 1809, Nelson put his glass to his blind eye and said he really did not see the signal. Robert Southey's 1813 life of Nelson gives the exchange in its familiar shape, with an oath, an appeal to the captain, and the line about having a right to be blind sometimes. The attack continued and the British fleet won.

The joining happened in the decades that followed. Martha Wilmot's letters of the 1820s use the shortened phrase casually, in a way that assumes the reader knows it, and the form appears in print in a sporting magazine in 1832. By then the image of a man with one blind eye was available to any writer who wanted a vivid way to say that someone chose not to see. That is what made the two halves fit, and it is why the story became the standard explanation for a phrase that did not need one.

The blind eye in law

English law took the image and made it a term of art. Courts describe deliberate avoidance of knowledge as Nelsonian knowledge, or blind-eye knowledge, and treat it as a form of actual knowledge rather than as ignorance.

Two authorities are worth naming. In Twinsectra Ltd v Yardley [2002] UKHL 12, the House of Lords used the phrase "Nelsonian knowledge" for the case where a person shuts his eyes to the facts and is then taken to know them. In Manifest Shipping Co Ltd v Uni-Polaris Shipping Co Ltd [2003] 1 AC 469, Lord Clyde set out what the doctrine requires of the person: a conscious reason for blinding the eye, at least a suspicion of a truth about which he does not want to know, and a refusal to investigate it.

That definition is the legal version of the everyday idiom, and it is stricter than the popular one. Merely failing to notice something is negligence. Choosing not to look, for a reason you would rather not examine, is the state of mind the phrase describes.

Why the story survives a correction

Folk etymologies usually fail because someone invents a plausible tale with no evidence behind it. This one is unusual, because the anecdote is documented and the attribution is the part that is wrong.

Three features keep the Nelson story in circulation. It has a named hero, a single dramatic moment and a physical object, the telescope, that turns an abstract idea into an image. It arrives with a quotation, in versions from two early biographies, and quotations travel further than the argument around them. And it explains the phrase well enough that nobody checks the older record.

The correction does not spoil the story. The Copenhagen episode is a real example of a commander deciding not to see an order he disliked, and the phrase is a real idiom for exactly that act. The dated record simply puts them in the right order.

How to check a phrase origin yourself

Five steps cover most cases.

• Start with a dated dictionary. The Oxford English Dictionary gives the earliest citation it can support for a sense, and it reports competing explanations where the evidence is thin.
• Ask what the earliest citation actually says. A longer form such as "the deaf ear and the blind eye" is evidence for the image, not for the modern wording.
• Check the date of the story against the date of the phrase. Anecdotes that surface decades after the phrase is first used are more likely to have popularised it than to have created it.
• Look for a quotation's first appearance. Clarke and M'Arthur in 1809 and Southey in 1813 both report Nelson's words, and neither was on the quarterdeck. A remembered quotation is evidence of what was believed, not of what was said.
• Prefer a scholarly dictionary to a listicle when the two disagree, and read the disagreement rather than the conclusion.

The narrative above draws on John Norris, A Discourse of Walking by Faith (1698); Francis Lathom, Men and Manners (1800); Clarke and M'Arthur, The Life of Admiral Lord Nelson (1809); Robert Southey, The Life of Horatio Lord Nelson (1813); the letters of Martha Wilmot covering 1819 to 1829, later published in book form; The New Sporting Magazine, December 1832; Twinsectra Ltd v Yardley [2002] UKHL 12; and Manifest Shipping Co Ltd v Uni-Polaris Shipping Co Ltd [2003] 1 AC 469.

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