[bahy-in] 
| 1. | an act or instance of buying in. |
| 2. | the deliberate submission of a false bid, too low to be met, in order to win a contract. |
| 3. | Poker. the chips purchased by a player from the banker, occasionally a set amount required to enter a specific competition or game. |
Buy-In
When an investor is forced to repurchase shares because the seller did not deliver the securities in a timely fashion, or did not deliver them at all.
Investopedia Commentary
Those who fail to deliver the securities will be notified with a buy-in notice. Failure to answer the buy-in notice means the broker can buy the securities and deliver them on your behalf. You must then pay back the broker at whatever price.
See also: Sell-Out
Also spelled: BuyIn, Buy In