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An aggressive child who repeatedly victimizes a less powerful child with physical and/or emotional abuse.

Bullying usually involves an older or larger child (or several children) victimizing a single child who is incapable of defending himself or herself. Although much bullying goes unreported, it is estimated that in the average school an incident of bullying occurs approximately once every seven minutes. Bullying occurs at about the same rate regardless of class size or school size, but, for an unknown reason, rural schools appear to have a higher rate of bullying than urban or suburban schools. Even when bullying is reported, it is not always taken seriously by teachers and parents because many adults believe that children should learn to "stand up for themselves" or "fight back."

Although the stereotypical bully is male, girls engage in bullying behavior almost as often as boys. Their tactics...