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Douglas Harper's Etymology Dictionary

verbal phrase, "to purchase a commission or stock," 1826, from buy (v.) + in (adv.). As a noun by 1970.


n. 1 support; agreement; approval; blessing (in a secular sense). 2 (context poker English) A tournament where a player must purchase all of his or her chips before the tournament starts. 3 (context poker English) The amount that a player buy in for

Usage examples of "buy-in".

You've been getting penalized like a player in a tournament who oversleeps and automatically gets all the antes and blind bets deducted from his absentee buy-in, and those involuntary bets haveā€”have cost you, horribly.