play a part
US /pleɪ ə pɑːrt/
UK /pleɪ ə pɑːrt/

1.
to be involved in something and have an effect on it
:
•
Everyone needs to play a part in protecting the environment.
•
Stress can play a part in many health problems.
2.
to perform a role in a play or film
:
•
She hopes to play a part in the school musical.
•
He was chosen to play a part in the new movie.