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springlock

[spring-lok]
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noun
  1. a lock that fastens automatically by a spring.
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Origin of springlock

First recorded in 1475–85; spring + lock1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for spring lock

spring lock

noun
  1. a type of lock having a spring-loaded bolt, a key being required only to unlock it
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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