Child on child abuse
occurs when a young person (under 18 years old) is exploited, bullied and/or harmed by their peers, who are the same or similar age. Child on child abuse can include physical and sexual abuse, sexual harassment and violence, emotional harm, bullying (including cyberbullying) and teenage relationship abuse.
You can get more information about Child on child abuse from:
https://www.childline.org.uk/info-advice/bullying-abuse-safety/types-bullying/
https://youngminds.org.uk/find-help/feelings-and-symptoms/bullying/