noun
plural -sons
a substance that can cause people or animals to die or to become very sick if it gets into their bodies especially by being swallowed [noncount]
something (such as an idea, emotion, or situation) that is very harmful or unpleasant [noncount]
what's your poison?
informal + old-fashioned - used to ask what kind of alcoholic drink someone wants to be served;
verb
-sons; -soned; -soning
[+ obj] to cause (a person or animal) to die or to become very sick with poison
to put a harmful or deadly substance in or on (something)
to change (something) in a very harmful or unpleasant way
poisoned chalice