As a Noun: 1. A substance that harms or kills people or animals if they swallow it or absorb it. English = poison. 2. A person who gossips quite viciously. As a Verb or Adjective: 1. To kill a person or to make them ill by means of poison. English = poison. 2. To have the ability to kill you or make you ill if you eat it or absorb it in some way. English = (be) poisonous. 3. To have the ability to gossip quite viciously.