bouncer

Etymology

From bounce + -er.

noun

1. (informal) A member of security personnel employed by bars, nightclubs, etc to maintain order and deal with patrons who cause trouble.
   At 199 centimetres and a hundred kilos going up, he was scary big and he found work as a bouncer and enforcer[.] 2010, Peter Corris, Torn Apart, Allen and Unwin, page 117
2. (cricket) A short-pitched ball that bounces up towards, or above the height of the batsman’s head.
3. (Internet) An account or server (as with IRC and FTP) that invisibly redirects requests to another, used for anonymity or vanity.
4. (dated) One who bounces; a large, heavy person who makes much noise in moving.
5. (slang, archaic) A boaster; a bully.
6. Something big; a good stout example of the kind.
   The stone must be a bouncer. 1842, Thomas De Quincey, “Modern Greece”, in Blackwood's Magazine
7. (slang, archaic) A bold lie.
   "… when he wants to accomplish his purpose, he does not hesitate to invent—I am not quite sure of the word, but I think it is “bouncers.” 1877, W. S. Gilbert, “Engaged”, in Original Plays, Second Series, London: Chatto & Windus, published 1899, page 83
8. (slang, archaic) A liar.
9. A bouncy castle.
10. A kind of seat mounted in a framework in which a baby can bounce up and down.
    He shook his head and took up the child—Dilly kicked out her feet in tiny electric jolts to the full stretch of the Babygro.[…]He put the child in the bouncer again. 2019, Kevin Barry, Night Boat to Tangier, New York: Doubleday, pages 82–83