Meaning of “skull and crossbones” in the English Dictionary

british dictionary

"skull and crossbones" in British English

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skull and crossbonesnoun [ S ]

uk /ˌskʌl ən ˈkrɒs.bəʊnz/ us /ˌskʌl ən ˈkrɑːs.boʊnz/

a picture of a skull with two long bones crossing each other under it that warns of death or danger, used in the past on pirate flags and now on containers or places containing dangerous substances or machinery

(Definition of “skull and crossbones” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)