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.
(..) it was gonna take ten hours? You've been playing for ten hours? - Dad, don't you think that more... - I think you should listen to your mother. - - Dang dumb piece of junk. Oh, I got it! - Does the seven count? - It was a seven? Did Mike see it? Then it doesn't count. (..)2016 TvShow: Stranger Things Title: Chapter One: The Vanishing of Will Byers Season: 1 Episode 1