[ bahy-in ]
/ ˈbaɪˌɪn /


an act or instance of buying in.
the deliberate submission of a false bid, too low to be met, in order to win a contract.
Poker. the chips purchased by a player from the banker, occasionally a set amount required to enter a specific competition or game.

Origin of buy-in

noun use of verb phrase buy in

Definition for buy in (2 of 2)

Origin of buy

before 1000; Middle English byen, variant of byggen, buggen, Old English bycgan; cognate with Old Saxon buggjan, Gothic bugjan to buy, Old Norse byggja to lend, rent
1 sell.
Related forms
Can be confusedbuy by bye

Synonym study

1. Buy, purchase imply obtaining or acquiring property or goods for a price. Buy is the common and informal word, applying to any such transaction: to buy a house, vegetables at the market. Purchase is more formal and may connote buying on a larger scale, in a finer store, and the like: to purchase a year's supplies. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for buy in (1 of 2)

buy in

verb (adverb)

(tr) to buy back for the owner (an item in an auction) at or below the reserve price
(intr) to purchase shares in a company
(intr) to buy goods or securities on the open market against a defaulting seller, charging this seller with any market differences
Also: buy into (tr) US informal to pay money to secure a position or place for (someone, esp oneself) in some organization, esp a business or club
to purchase (goods, etc) in large quantitiesto buy in for the winter

noun buy-in

the purchase of a company by a manager or group who does not work for that company

British Dictionary definitions for buy in (2 of 2)


/ (baɪ) /

verb buys, buying or bought (mainly tr)


a purchase (often in the phrases good or bad buy)

Word Origin for buy

Old English bycgan; related to Old Norse byggja to let out, lend, Gothic bugjan to buy


The use of off after buy as in I bought this off my neighbour was formerly considered incorrect, but is now acceptable in informal contexts
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012