Real Dictionary

bang
countable noun: A bang is a sudden loud noise such as the noise of an explosion.
verb: If something bangs, it makes a sudden loud noise, once or several times.
verb: If you bang a door or if it bangs, it closes suddenly with a loud noise.
verb: If you bang on something or if you bang it, you hit it hard, making a loud noise.
verb: If you bang something on something or if you bang it down, you quickly and violently put it on a surface, because you are angry.

bang in American English 1
a hard, noisy blow or impact
to hit with a resounding blow; strike hard and noisily
to make a loud noise, as through concussion or explosion
intransitive verb: to strike violently or noisily
noun: a loud, sudden, explosive noise, as the discharge of a gun
transitive verb: to strike or beat resoundingly; pound

bang in American English 2
banged hair across the forehead
to cut (hair) short and straight across
noun: a fringe of hair combed or brushed forward over the forehead
transitive verb: to cut (the hair) so as to form a fringe over the forehead

bang in American English 3
bhang
noun

bang in British English 1
noun: a short loud explosive noise, as of the bursting of a balloon or the report of a gun

bang in British English 2
to cut (the hair) in such a style
noun: a fringe or section of hair cut straight across the forehead

bang in British English 3
noun