dim up(redirected from dimmed up)
To cause dim lights to become brighter. We knew that the band wasn't going to play another encore when the lights in the arena dimmed up.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
dim something up
to use a dimmer to make the lights brighter. (Theatrical. A dimmer is a rheostat, variable transformer, or something similar. The expression, a seeming contradiction, is the opposite of dim something down.) As the curtain rose, the electrician dimmed the lights up on a beautiful scene. You dimmed up the lights too fast.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.