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.
The administration of a poison.
The state of being poisoned.