play the fool
US /pleɪ ðə fuːl/
UK /pleɪ ðə fuːl/

1.
装傻, 扮小丑
to behave in a silly or foolish way, often to entertain others or to avoid responsibility
:
•
Stop playing the fool and take this seriously.
别再装傻了,认真对待这件事。
•
He was always playing the fool to make his friends laugh.
他总是装傻逗朋友们笑。