American Dictionary

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Definition lock in in American English

lock in phrasal verb

[transitive] phrasal verb
1

to put someone in a room and lock the door so they cannot leave

Example

You can't keep me locked in.

Example

She went to her hotel room and locked herself in.

Synonyms and related words
2

to get a financial benefit that continues for a long time, for example by selling stocks that have gone up in value before they can go back down

Synonyms and related words
Definition lock in in American English