Definition from Wiktionary, the free dictionary
bullying (plural bullyings)
- An act of intimidating a weaker person to do something, especially such repeated coercion.
- Persistent acts intended to make life unpleasant for another person.
- Bullying is a punishable offense in all schools.
Related terms 
act of intimidating a weaker person
persistent acts intended to make life unpleasant
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See also 
- Present participle of bully.
bullying m (usually uncountable)
- school bullying