lock in

Idioms & Phrases

lock in

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

  2. Also, lock into. Fix firmly in position, commit to something. This phrase often occurs as be locked in or into, as in She felt she was locked in a binding agreement, or Many of the stockholders are locked into their present positions. [Mid-1900s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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