temporary leader

noun
UK /ˈtɛmpərəri ˈliːdə/
US /ˈtɛmpəreri ˈliːdər/

A temporary leader is someone who is in charge for just a little while.

When the teacher stepped out, Mia became the temporary leader of the class.


OTHER MEANINGS

2. A person who leads a group only until a permanent leader is chosen.

The club chose a temporary leader until the new president arrived.

3. Someone who takes charge during a short break or emergency.

During the fire drill, the temporary leader helped everyone line up.

4. A stand-in who keeps things running smoothly for a short time.

The temporary leader made sure the meeting started on time.