poison pill
noun/ˌpɔɪzn ˈpɪl/
/ˌpɔɪzn ˈpɪl/
(informal, business)- a form of defence used by a company to prevent, or to reduce the effect of, a takeover that they do not want, for example by selling some of their important possessions
（公司为防止被兼并而采取的）自戕式防御；（出售某些重要财产以求最终自保的）掏空政策