poison

A substance that is harmful or lethal to a living organism.

“We used a poison to kill the weeds.”

Something that harms a person or thing.

“Gossip is a malicious poison.”

A drink; liquor.

“— I'll have a glass of whisky.”

Any substance that inhibits catalytic activity.

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.