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Phrase(s): 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.
McGrawhill's American Idioms And Phrasal Verbs