As we came out of the prison through the lodge, I found that the great importance of my guardian was appreciated by the turnkeys, no less than by those whom they held in charge.
Charles Dickens. Great Expectations (1861)
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The turnkey, who received us at Clerkenwell, looked remarkably sullen; and when we enquired for Clinker, 'I don't care, if the devil had him (said he); here has been nothing but canting and praying since the fellow entered the place.
Tobias Smollett. The Expedition of Humphry Clinker (1771)
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there are no monitors in the security posts—somewhere along the line you have to stop guarding the guardians or everyone in the world would be a goddam turnkey