[ lok-in ]

  1. an act or instance of becoming unalterable, unmovable, or rigid.

  2. commitment, binding, or restriction.

Origin of lock-in

First recorded in 1965–70; noun use of verb phrase lock in

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How to use lock-in in a sentence

British Dictionary definitions for lock-in


  1. an illegal session of selling alcohol in a bar after the time when it should, by law, be closed

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

Other Idioms and Phrases with lock-in


Enclose, surround, as in The ship was completely locked in ice. [c. 1400s]

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.