combination-lock

combination lock

noun
a lock opened by rotating one or more specially marked dials a given number of times through a particular set of positions in a prescribed order and direction.

Origin:
1850–55

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
combination lock
 
n
a type of lock that can only be opened when a set of dials releasing the tumblers of the lock are turned to show a specific sequence of numbers

Collins English Dictionary - Complete & Unabridged 10th Edition
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