put on an act
US /pʊt ɑn ən ækt/
UK /pʊt ɑn ən ækt/

1.
演戏, 装模作样
to pretend to be someone or something that you are not, or to pretend to feel something that you do not feel
:
•
She was just putting on an act to get attention.
她只是在演戏以引起注意。
•
Don't believe him, he's always putting on an act.
别相信他,他总是在演戏。