A copycat crime is committed by someone who is copying someone else. a series of copycat attacks by hooligan gangs
disapproval If you call someone a copycat, you are accusing them of copying your behaviour, dress, or ideas. The Beatles have copycats all over the world. someone who copies other people's clothes, behaviour, work etc - used by children to show disapproval. copycat crime/attack etc a crime, attack etc which is similar to a famous crime that another person has committed