beat someone's brains out

• Audio (General Australian):

  (file)

beat someone's brains out (third-person singular simple present beats someone's brains out, present participle beating someone's brains out, simple past beat someone's brains out, past participle beaten someone's brains out or beat someone's brains out)

1. (idiomatic) To beat someone very severely.

• punch someone's lights out

• beat one's brains out