spike
noun
°A sort of very large nail; also, a piece of pointed iron set with points upward or outward.
°Anything resembling such a nail in shape.
verb
°To covertly put alcohol or another intoxicating substance in a drink that previously did not contain such substances.
°To add a small amount of one substance to another.
synonyms: catkin, raceme, cluster, corymb more» , umbel, attack, hit