bounc ‧ er /ˈbaʊnsə $ -ər/ BrE AmE noun [countable]
1 . someone whose job is to stand at the door of a club, bar etc and stop unwanted people coming in, or make people leave if they are behaving badly
2 . a fast ball in ↑ cricket that passes or hits the ↑ batsman above the chest after it bounces