double chin

noun

1. A layer of subcutaneous fat under the chin, giving the appearance of having an extra chin.

   “"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.”