
Sit in for
Temporary Substitute
Indicates a short-term replacement for someone, not a permanent change.

Tom will sit in for me just for today's presentation.
Willingness to Help
Shows willingness to assist by taking over someone's responsibilities.

I can sit in for you while you recover from your surgery.
Professional Context
Often used in work environments to describe covering for a colleague.

During the audit, Janet will sit in for our regular accountant.
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