greenmail

/G R IY1 N M EY0 L/
noun
  1. 1

    Profiting from an attempted hostile takeover by forcing the target company to buy back the hostile bidder's shares at an inflated price.

verb
  1. 1

    To profit from an attempted hostile takeover by forcing the target company to buy back the hostile bidder's shares at an inflated price.

Source: https://en.wiktionary.org/wiki/greenmail