pound head in
pound (one's) head in
To give one a severe, violent beating (not necessarily solely on the head). The police officer threatened to pound the man's head in if he didn't stop resisting arrest. You watch your mouth, or I'll pound your head in!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
pound someone's head in
Fig. to beat someone, especially about the head. Fred looked like he wanted to pound Mike's head in; he was so mad! You want me to pound in your head?
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.