verb

1. To use poison to kill or paralyse (somebody).

   “The assassin poisoned the king.”

2. To pollute; to cause to become poisonous.

   “That factory is poisoning the river.”

3. To cause to become much worse.

   “He poisoned the mood in the room with his non-stop criticism.”

Synonyms: corrupt, taint, contaminate, pollute, taint

adjective

1. (of a living thing) Killed, paralysed, or harmed by receiving a dose of poison.

2. (of food or drink) Containing poison.

3. (of a pawn) Such that its capture will lessen the capturing player's chance of winning.