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Definition of monster
an imaginary creature that is typically large, ugly, and frightening. an inhumanly cruel or wicked person:he was an unfeeling, treacherous monster
often humorous a person, typically a child, who is rude or badly behaved:Christopher is only a year old, but already he is a little monster
a thing or animal that is excessively or dauntingly large:this is a monster of a book, almost 2,000 pages [as modifier]:a monster 120-mm gun a congenitally malformed or mutant animal or plant.
verb [with object] informal, chiefly British
criticize or reprimand severely:my mother used to monster me for coming home so late