Verb
(informal, transitive) To break or dent badly by hitting violently.
We got home to find that someone had bashed in the door.
(informal, transitive) To injure (someone) with violent blows.
Careful, or I'll bash your face in!
It's not enough to bash in heads. You've got to bash in minds. Joss Whedon
Tell the truth, and people will bash in your head. Hungarian Proverb