poison pill

English Thesaurus

1. the target company defends itself by making its stock less attractive to an acquirer (noun.act)

hypernym	:	porcupine provision, shark repellent,
definition	:	a measure undertaken by a corporation to discourage unwanted takeover attempts (noun.act)

hyponym	:	suicide pill,
definition	:	a poison pill with potentially catastrophic implications for the company it is intended to protect (noun.act)