openingunderstudy

noun
UK /ˈəʊpənɪŋ ˈʌndəstʌdi/
US /ˈoʊpənɪŋ ˈʌndərstʌdi/

A person who learns a part in a play so they can act it if the main actor cannot.

The openingunderstudy practiced every day in case the star got sick.


OTHER MEANINGS

2. A second actor ready to take over a role at the start of a show.

The openingunderstudy was nervous before the first night.

3. Someone who learns a job by watching and helping another worker.

She was the openingunderstudy for the head chef.

4. A person who takes another's place in an emergency.

He acted as an openingunderstudy when the speaker was late.