An onlooker is someone who stands by while someone else is being bullied. Or they may join in with name calling, even though they are not the ringleader.
Listen to friends who are being bullied or who are bullying other children. Try talking to them about what their feelings are and how they are behaving.
Don't join in with people who bully - it isn't big to make others feel small.
Try not to ignore things you know are wrong because you are worried that you will be bullied too.
Tell an adult about what is happening.
Encourage friends to ask for help if they are being bullied or are bullying others.