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English definition of “underage”

underage

adjective     /ˌʌn.dəˈreɪdʒ/ US  /-dɚˈeɪdʒ/
younger than the lowest age at which a particular activity is legally or usually allowed: There are laws against underage sex and underage drinking. He was prosecuted for having sex with a girl who was underage.Describing people who are young
(Definition of underage adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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