bullying

Bullying is the act of intentionally causing harm to others, through verbal harassment, physical assault, or other more subtle methods of coercion such as manipulation. Bullying can be defined in many different ways. Although the UK currently has no legal definition of bullying,[2] some US states have laws against it. Bullying is usually done to coerce others by fear or threat.[3]
Bullying in school and the workplace is also referred to as peer abuse.
In colloquial speech, bullying often describes a form of harassment perpetrated by an abuser who possesses more physical and/or social power and dominance than the victim. The victim of bullying is sometimes referred to as a target. The harassment can be verbal, physical and/or emotional. Sometimes bullies will pick on people bigger or smaller than their size. Bullies hurt people verbally and physically. There are many reasons for that. One of them is because the bullies themselves are or have been the victim of bullying[4][5][6] (e.g. a bullying child who is abused at home, or bullying adults who are abused by their colleagues).
Many programs have been started to prevent bullying at schools with promotional speakers. Bullying consists of three types - verbal, physical and emotional.
Norwegian researcher Dan Olweus defines bullying as when a person is "exposed, repeatedly and over time, to negative actions on the part of one or more other persons." He defines negative action as "when a person intentionally inflicts injury or discomfort upon another person, through physical contact, through words or in other ways."[7] See also a reference to the Olweus Bullying Prevention Program at Clemson University: http://www.clemson.edu/olweus/ .
Bullying can occur in any setting where human beings interact with each other. This includes school, church, the workplace, home and neighborhoods. It is even a common push factor in migration. Bullying can exist between social groups, social classes and even between countries (see Jingoism)

source : http://en.wikipedia.org/wiki/Bullying