smash somebody's face/head in(redirected from smash head in)
smash someone's face in
1. Fig. to crush someone's face. The accident smashed Harry's face in, and he had to have extensive surgery. The accident smashed in his face.
2. Inf. to strike someone in the face. You had better stop that or I will smash your face in. Max tried to smash in Lefty's face.