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English definition of “skull and crossbones”

skull and crossbones

noun [S]    
a picture of a skull with two long bones crossing each other under it, which warns of death or danger, used in the past on pirate flags and now on containers or places containing dangerous substances or machineryFlags
(Definition of skull and crossbones noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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