Bouncer (noun)

1. A person employed to provide security at a public venue, such as a nightclub or bar, by controlling access and removing unruly patrons.
2. A person whose job is to maintain order and enforce rules in a public place.

Origin:

Of uncertain origin, possibly derived from the verb 'bounce' meaning to move quickly and forcefully.

Examples:

1. The bouncer at the door checked IDs and made sure no one under age entered the bar.
2. The bouncer had to escort several rowdy patrons out of the club.
3. She felt safer knowing that a bouncer was on duty at the concert.
4. The bouncer used his impressive size to intimidate unruly customers.
5. The bouncer was known for his fair and professional handling of difficult situations.