poison-v; 2 Senses

Sense Number 1: kill or spoil with or as with poison

Her unconcealed hostility poisoned the atmosphere.
She poisoned Henry's mistress.
The mushrooms apparently poisoned the entire Aquatics center.

VerbNet: poison-42.2
FrameNet: NM
PropBank: poison.01
WordNet 3.0 Sense Numbers: 1, 2, 4

Sense Number 2: add or administer poison to

She poisoned her husband, but he did not die.
Her husband poisoned her drink.

VerbNet: butter-9.9
FrameNet: Cause_harm
PropBank: poison.02
WordNet 3.0 Sense Numbers: 3, 5