Poison Pill Definition

A strategy intended to make a hostile takeover of a corporation more difficult, as by granting of special rights to existing shareholders upon the occurrence of the purchase of a significant amount of stock by an intended acquirer.

Any defensive measure for preventing the takeover of a corporation by making its acquisition prohibitively expensive for the party attempting to acquire it.

(politics) A provision in a bill that leads to people who would have supported it opposing it instead.