muffle up

muffle up

To dampen or silence a loud noise. A noun or pronoun can be used between "muffle" and "up." The assassin used a pillow to muffle up the sound of the gun. I put on extra thick socks to muffle my footsteps up, but Tom was still able to hear me. The walls in our apartment do almost nothing to muffle up the sounds coming from the adjoining room.
See also: up
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

muffle something up

to deaden or stifle a sound. Betty tried to muffle the sounds up, but everyone heard what was going on. She muffled up the sounds.
See also: up
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
See also: