sit in for
This page is about the phrasal verb sit in for
to take someone's place when they are absent
stand in for
- sit in for sb The manager has attended most of the negotiations, but his assistant sat in for him a couple of times.
- sit in for sb I can't make it to today's meeting, so would you mind sitting in for me?
It would be wrong to sit in for someone if they couldn't make it to
Contributor: Matt Errey