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Something added to a situation, company, deal, object, etc., to make it undesirable to takers, buyers, thieves, investors, or conquerors.
"They're planning a hostile takeover of our company, but we're taking on a huge debt which ought to serve as a poison pill and turn them off."
by anarcissie May 17, 2008
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2
The actions done by a party to screw another party after a major change has been completed or in the mix.
John Doe the outstanding CEO of ABC company resigned from his job today due to a takeover bid from XYZ. This will most likey lower the stock price of the company and make it undervalued vs. XYZ's bid. John Doe's Poison Pill will make make XYZ's bid overvalued.
by John Willikins December 10, 2005
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In business a tactic used by a company threatened with an unwelcome takeover bid to make itself unattractive to the bidder.

A similar method is used in a social setting when one person attempts to deflect or show lack of interest expressed by another by making his or herself appear socially unattractive or unobtainable.
Once Anthony learned that Kathy was interested in him, he promptly dropped a poison pill by letting it be known that he had recently begun dating Shelia.
by Who 'Dis? Who 'Dat? May 24, 2018
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