hush down(redirected from hush that down)
1. To become quiet and still. The auditorium hushed down as the conductor took the stage. OK, kids, please hush down so I can start the movie.
2. To cause, command, or instruct someone or some group to become quiet. In this usage, a noun or pronoun can be used between "hush" and "down." The teacher slammed the ruler against the desk, which hushed down the classroom immediately. The child sat screaming in her seat, with her parents trying anything they could think of to hush her down.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.