If someone does something because of peer pressure , they do it because other people in their social group do it.
Naomi admits that it was peer pressure to be ’cool’ that drove her into having sex early.
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PEER PRESSURE
Meaning of PEER PRESSURE in English
Collins COBUILD Advanced Learner's English Dictionary. Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне. 2006