to strike (something) sharply; to bump (something)

He fell and banged his knee

to knock, beat, or strike (something) hard, often with a loud sharp or metallic noise

to cause (something) to make a loud sharp or metallic noise

Don't bang the door!

coarse slang said of a person: to have sexual intercourse with (somebody)

to strike, close, etc with a loud sharp noise or thump

The falling chair banged against the wall

to produce a sharp often explosive noise or noises

(+ about/around) to move about noisily

slang to inject heroin or another drug

a resounding blow; a thump

often used as a descriptive interjection: a sudden loud noise

a quick or impressive burst of energy or activity

The party finished with a bang

coarse slang an act of sexual intercourse

slang an injection of heroin or another drug

right or directly

The door hit him bang in the face

exactly

They arrived bang on six o'clock