The cab was discharged, and the three gentlemen were not long in discovering the small door, which was a sort of postern in a lane between two garden walls.
Robert Louis Stevenson. The Suicide Club
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Instead of taking the short cut along the Sound we went down the road and entered by the big postern.
Francis Scott Fitzgerald. The Great Gatsby
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That hidden postern door could be used, perhaps.
Diana Gabaldon. Outlander (1991)
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I passed through the postern and crossed the drawbridge in her company,