Dictionary

skull and crossbones

noun skull and cross·bones \-ˈkrs-ˌbōnz\

: a picture of a human skull above two crossed bones that was used on the flags of pirate ships in the past and is now used as a warning label on containers of poisonous or dangerous substances

plural skulls and crossbones

Full Definition of SKULL AND CROSSBONES

:  a representation of a human skull over crossbones usually used as a warning of danger to life

First Known Use of SKULL AND CROSSBONES

1826

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