optical fibrenoun [ C ]UK US optical fiber uk /ˌɒp.tɪ.kəl ˈfaɪ.bər/ us /ˌɑːp.tɪ.kəl ˈfaɪ.bɚ/
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(Definition of “optical fibre” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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said to emphasize that being part of a group makes you less likely to be harmed