See fill in for more
fill-in
ˈfill-in
noun [singular] British English informal
someone who does someone else’s job because that person is not there
SYN stand-in:
I’m here as a fill-in while Robert’s away.
ˈfill-in
noun [singular] British English informalsomeone who does someone else’s job because that person is not there
SYN stand-in: