Wiktionary
poison pills
n. (poison pill English)
Usage examples of "poison pills".
They thought in terms of hostile takeovers, poison pills, golden parachutes.
All the men selected to operate such devices were equipped with fast-acting poison pills for use on such occasions to ensure the secret they had sworn to keep died with them.
I asked why she just didn't give it to them now, but her father's will expressly forbade it with a couple of poison pills she was unwilling to invoke.