stand in for
Intermediate (B1)neutral
To do someone's job for them while they are away.
"Can you stand in for me at the meeting on Thursday? I have a doctor's appointment."
Hear it in context

12 Everyday English Phrases to Sound Natural and Confident
English Like A Native · 4:49
Number four, stand in for someone.

Sunrise on the Reaping A Hunger Games Novel By Suzanne Collins AudioBook P1
AudioBookEng · 293:10
column lying on the floor stand in for trees.

Vancouver Never Plays Itself
Every Frame a Painting · 4:57
of anonymous buildings that can stand in for anywhere else.

Jews with Heterodox Views: Joshua Stylman on DarkHorse
Bret Weinstein · 79:05
are fictions that stand in for approximations without being true themselves.

A Dark Fantasy Audiobook: Reborn With A Divine System And Hidden Power (Book 1-4) | Complete Series
NoirCast · 2950:44
I'll be happy to stand in for him if you are