be (as) quiet as a mouse
(redirected from are quiet as a mouse)be (as) quiet as a mouse
To be silent and meek. I just can't believe that Kate actually yelled at Mike—she's as quiet as a mouse! I always tell my young son that he needs to be quiet as a mouse during the church service.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.