To secure (someone or something) in a locked enclosure.
The dog won't escape now we've locked him in.
To fix the value of (something potentially variable).
I've locked in a rate of 5%.
To prevent (someone or something) from escaping, deteriorating, or switching to an alternative.
Our new foil packets keep the flavour of the crisps locked in.
Nonstandard spelling of lock-in.
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