night latch

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noun

a door lock operated from the inside by a knob and from the outside by a key.

Origin of night latch

First recorded in 1850–55
Also called night bolt.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for night latch

night latch

noun

a door lock that is operated by means of a knob on the inside and a key on the outside

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012