Definition of "skull and crossbones" []

• A representation of a human skull above two long crossed bones, a symbol of death once used by pirates and now used as a warning label on poisons. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "He held a square white box, marked with a skull and crossbones and the word SKULLIONI’S, aloft in one hand."
• "If I had been on a diet, I would have responded to the evening by going out and getting the biggest, gooiest, chocolate-mocha-dark-fudge-cream-cheese cheesecake, one that had a skull and crossbones on its box, that’s how bad it was for you."