https://www.phrases.org.uk/meanings/sent-to-coventry.html
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The first known citation of the allusory meaning is from the Club Book of the Tarporley Hunt, 1765:
“Mr. John Barry having sent the Fox Hounds to a different place to what was ordered … was sent to Coventry, but return’d upon giving six bottles of Claret to the Hunt.”
By 1811, the then understood meaning of the term was defined in Grose’s The Dictionary of the Vulgar Tongue:
To send one to Coventry; a punishment inflicted by officers of the army on such of their brethren as are testy, or have been guilty of improper behaviour, not worthy the cognizance of a court martial. The person sent to Coventry is considered as absent; no one must speak to or answer any question he asks, except relative to duty, under penalty of being also sent to the same place. On a proper submission, the penitent is recalled, and welcomed by the mess, as just returned from a journey to Coventry.
A well-known example of someone being sent to Coventry is Charles Dodgson (Lewis Carroll), after his falling out with the Liddell family. Dodgson had developed a close relationship with the Liddell’s daughter Alice. In 1863, when Alice was 11, something happened to cause the family to ostracize him. Whatever it was we can’t now be sure as, although Dodgson recorded it in his diary at the time, the entry was later cut out by a Dodgson family member. This has led to widespread but unproven speculation that the relationship between Dodgson and Alice was inappropriate in some way – possibly what would now be called paedophilic.
