To use poison to kill or paralyse (somebody).
The assassin poisoned the king.
To pollute; to cause to become poisonous.
That factory is poisoning the river.
To cause to become much worse.
He poisoned the mood in the room with his non-stop criticism.
To cause (someone) to hate or to have unfair negative opinions.
She's poisoned him against all his old friends.
To inhibit the catalytic activity of.
To place false information into (a cache) as part of an exploit.
(of a living thing) Killed, paralysed, or harmed by receiving a dose of poison.
(of food or drink) Containing poison.
(of a pawn) Such that its capture will lessen the capturing player's chance of winning.