peer pressure
noun [ U ] uk/ˈpɪə ˌpreʃ.ər/ us/ˈpɪr ˌpreʃ.ɚ/ (UK also peer group pressure)
同龄人（尤指儿童）间的压力；同辈间的压力
the strong influence of a group, especially of children, on members of that group to behave as everyone else does
There is tremendous peer pressure to wear fashionable clothes. 同龄人之间存在着互相攀比穿着流行服饰的巨大压力。