I wondered that. The implication of "poison pill" is that something that looks broadly OK actually contains a detail that renders it very perilous. The canonica

I wondered that. The implication of "poison pill" is that something that looks broadly OK actually contains a detail that renders it very perilous. The canonical example is a company arranging its finances in such a way that a hostile acquisition is too dangerous to risk. This isn't a detail; it's the whole point.