UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈɡriːnˌmeɪl/US:USA pronunciation: respellingUSA pronunciation: respelling(grēnmāl′)

WordReference Random House Unabridged Dictionary of American English © 2020
green•mail  (grēnmāl′),USA pronunciation n. [Stock Exchange.]
  1. Stock Exchange, Businessthe practice of buying a large block of a company's stock in order to force a rise in stock prices or an offer by the company to repurchase that block of stock at an inflated price to thwart a possible takeover bid.
greenmail′er, n. 
  • green (in sense "money'') + (black)mail

Collins Concise English Dictionary © HarperCollins Publishers::
greenmail /ˈɡriːnˌmeɪl/ n
  1. (esp in the US) the practice of a company buying sufficient shares in another company to threaten takeover and making a quick profit as a result of the threatened company buying back its shares at a higher price
Etymology: 20th Century: a blend of green (sense 8) or greenback (sense 2) + blackmail

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