To administer poison to (a person or animal); to kill or injure with poison; = "poison". Also without object.

To add poison to (food, drink, etc.); to cover or impregnate (an object) with poison so as to make it harmful; to make poisonous or venomous.

To pollute or adulterate with a harmful or noxious substance; to contaminate.

To embitter (a person, his or her feelings, a relationship, etc.); to make hostile or malignant; to turn (a person or his or her mind) against.