play a part in
Also found in: Legal.
play a part in somethingand play a role in something
1. to participate in something in a specific way. I hope to play a part in the development of the new product. I want to play a role in this procedure.
2. to portray a character in a performance. He played a part in The Mikado, but it was not a major role. Larry wanted to play a role in the next play.