double chin

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double chin (plural double chins)

1. A layer of subcutaneous fat under the chin, giving the appearance of having an extra chin.
   • 1958 October, “Liverpool to London in 1842”, in Railway Magazine, page 682:

     "In the coach in which I rode, there was a vacant seat till our arrival in Birmingham. Leaving Birmingham I found it filled with a fat Englishman, in drab breeches and gaiter boots, the finest specimen of a thorough John Bull that I had seen—weight about sixteen stone. He wore two top coats, a broad brimmed hat, and an enormous red travelling shawl, behind the folds of which his portly double chin was entirely hidden.

• butt chin
• have more chins than a Chinese phone book