'greenmail' definitions:

Definition of 'greenmail'

(from WordNet)
noun
(corporation) the practice of purchasing enough shares in a firm to threaten a takeover and thereby forcing the owners to buy those shares back at a premium in order to stay in business

Definition of 'greenmail'

From: GCIDE
  • greenmail \green"mail\ n. (Finance) The act, performed by a publicly traded corporation, of paying a corporate raider to give up a takeover attempt, by buying the shares of stock he owns; also, the threat posed by corporate raiders to take over a company unless their stocks are purchased by the company at a price giving them a large profit. [Informal] [WordNet 1.5]