skull and crossbones

noun
🔊/ˌskʌl ən ˈkrɒsbəʊnz/
🔊/ˌskʌl ən ˈkrɔːsbəʊnz/
[singular]
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  1. 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骷髅旗,骷髅画(旧时画在海盗旗上,现在作为警示印在危险物品的容器上)