lock in

phrasal verb

Definition of lock in 

1 : to put or keep (someone or something) in a locked place, room, etc. She locked her brother in the bathroom. They locked the jewels in a safe. They threatened to lock him in jail.

2 : to do something that makes one sure to get (something that could change, such as a good price, an interest rate, etc.) If you sign the contract today, you can lock in this low interest rate before it goes any higher.

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Nglish: Translation of lock in for Spanish Speakers

Britannica English: Translation of lock in for Arabic Speakers

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by force of circumstances

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