fill in for somebody
to replace someone in a job for a short time
fill in for
to do someone else's job temporarily

[TahlilGaran] Dictionary of Contemporary English ▲

replace if one person replaces another, they do a job or activity instead of the other person, usually permanently:
The opposition leader Zhelyu Zhelev was elected to replace him.
How will we ever find anyone who can replace you?
The lead singer was replaced by Ray Willis back in 1992.
take somebody's place/take the place of somebody to do something instead of someone:
It will be difficult to find someone to take her place.
Doctor Rice is on holiday. I'm taking his place.
The court may allow another relative to take the place of the parent.
take over to replace someone in a job or position, and continue their work:
The new manager took over in July.
Sales are up (=they have increased)since he took over the company.
stand in for somebody to replace someone at work on a particular occasion:
She was filming in Australia, so she asked a friend to stand in for her at the awards ceremony.
During the dangerous scenes, stuntmen and women stand in for the actors.
fill in for somebody to replace someone in a job for a short time:
Susan will fill in for me while I'm away.
take something's place/take the place of something to be used instead of another thing:
If any of the eight units fails, its place will be taken by the back-up unit.
MP3 players are taking the place of CDs.
Ugly concrete apartment buildings have taken the place of the old houses.
supersede to take the place of something – used especially about inventions, methods, organizations etc:
The League of Nations was superseded by the United Nations in 1946.
Analysis by manual calculation has been superseded by more modern computer-based methods.
Goose used to be a traditional Christmas bird until turkey superseded it in popularity.
Iron began to supersede bronze for tool making about 3000 years ago.
substitute something for something to use something instead of the thing that you usually use, because the usual thing is not available – used especially about food:
You can substitute margarine for butter in most recipes.

[TahlilGaran] English Thesaurus ▲

fill in for
fill in (for (someone))
to do someone else's job temporarily.
He discovered his love of acting when he filled in for a sick friend in a college play.

[TahlilGaran] English Idioms Dictionary ▲

fill in for someone
fill in (for (someone))
to do someone else's job temporarily.
He discovered his love of acting when he filled in for a sick friend in a college play.

[TahlilGaran] English Idioms Dictionary ▲