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.
(..) But I can't give you this case, 'cause it don't belong to me. Besides, I been through too much shit over this case... to just hand it over to your dumb ass. Vincent! Be cool! Yolanda, it's cool, baby! It's cool! We still just talking! (..)1994 Pulp Fiction
(..) JULES: Get the fuck out my face with that shit. The motherfucker said that shit never had to pick up... itty-bitty pieces of skull on account of your dumb ass. VINCENT: I got a threshold, Jules. I got a threshold for the abuse that I will take. Right now, I'm a fucking (..)1994 Pulp Fiction