skull and crossbones
noun/ˌskʌl ən ˈkrɒsbəʊnz/
/ˌskʌl ən ˈkrɔːsbəʊnz/
[singular]- a picture of a human skull above two crossed bones, used in the past on the flags of pirate ships, and now used as a warning on containers with dangerous substances inside
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skull and crossbones