Definition from Wiktionary, the free dictionary
to bash in (phrasal verb)
- To break or dent badly by hitting violently.
- We got home to find that someone had bashed in the door.
- To injure someone by hitting violently.
- Careful, or I'll bash your face in!
- In all senses the object may appear before or after the particle. If the object is a pronoun, then it must be before the particle.