What does "play dumb" mean?
1. Definition (v.) pretend like you don’t know something that you do know
Examples The police asked where the criminals went, but their friends played dumb and said they didn’t know.
Examples She’s really smart, but she thinks guys won’t like her if they know that, so she plays dumb.
Examples When she asked if I knew it was her birthday, I played dumb. I didn’t want to let her know I was planning a surprise party.