brush off

Short definition from Wiktionary

Verb

1. 1
   To disregard (something), to dismiss or ignore (someone), as unimportant.
2. 2
   To depart with a sweeping motion; to rush away.
3. 3
   Used other than figuratively or idiomatically: see brush, off. To remove something with a brush.

Noun

1. 1
   Nonstandard spelling of brush-off.
2. 2
   An abrupt rebuff, a snub or curt rejection, a disdainful dismissal.