v. & n.
--v.
1. tr. a strike bluntly or heavily. b (often foll. by up) colloq. attack violently. c (often foll. by down, in, etc.) damage or break by striking forcibly.
2 intr. (foll. by into) collide with.
--n.
1. a heavy blow.
2 sl. an attempt (had a bash at painting).
3 sl. a party or social event.
Etymology: imit., perh. f. bang, smash, dash, etc.