Verb
To pretend to be dumb, whether
To feign muteness.
To feign stupidity or ignorance of some knowledge, usually in order to avoid responsibility or gain some advantage.
Synonym: play stupid
It takes a smart guy to play dumb. Mr. T
People assume actresses are afraid to get older; the truth is the roles get a whole lot more compelling once you're too old to play dumb. Olivia Wilde
"So their only option is to play dumb and hope Trump gets distracted by a Filet-O-Fish or something." Source: Internet
They may still be trying to ID the driver, sometimes they lie and play dumb until they look into every possible charging offense (perhaps unrelated) and/or locate the person and ensure they don't flee. Source: Internet