godan verb (-su), transitive verb
poison to death; kill by poisoning
Specifically refers to killing someone by administering poison, often in a deliberate or criminal context. The second gloss 'to kill by a prescription error' is a specific medical scenario, but the core meaning is poisoning.
彼は妻を盛り殺した容疑で逮捕された。
He was arrested on suspicion of poisoning his wife to death.
毒を盛って
Poisoning someone to death is a serious crime.