A bully is someone who uses intimidation and coercion, rather than reason, to impose his will on others. The act of being a bully is known as bullying. There can be many motivations for bullying, such as bad parenting, lack of rules as well as some psychological problems. Often, if a bully grows up poor or in a bad neighbourhood they will become a member of a gang. Name-calling is a technique characteristic of a bully.