Definition of put a lid on
1 : to stop (something) from growing or becoming worse These changes are intended to put a lid on rising medical costs.
2 informal : to stop doing or saying (something) He angrily told them to put a lid on their complaints. I'm tired of listening to your complaints, so just put a lid on it!
3 : to cause the end or failure of (something) The government used the army to put a lid on the rebellion.
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