She 'played/acted dumb' [=pretended to know or understand less than she really did] so we would assign her the easier tasks.
She thinks television is contributing to the 'dumbing down' of America.
Cutting training programs will 'dumb down' the American workforce.
(..) Little walky-walky. Don't you call me that! Wild Bill Hickok wasrt no range rider! He was just some bushwhacking John Law! Dumb son of a bitch sat with his back to the door, killed by a drunk. Oh, my suds and body. A history lesson. You never know what you'll get at work (..)1999 The Green Mile
(..) I'm gonna kill you! - I'm gonna take you out! - Percy! Percy! You little vermin! I'm gonna stomp your life out! It's just a little mouse, dumb merde. You ugly little piece of sh... HARRY: Are you listening to me? - Fuck! - Percy! - I'm gonna rip your diseased head off... (..)1999 The Green Mile