語源 低地ドイツ語plumpen、オランダ語plompen、plop、fallと同じ、擬音語かもしれない。heavy(重い)、large(大きい)が語源で、のちに肯定的になり、ふくよかな、ふくよかな女性を表す。
To plump; to strike, or shoot. I'll give you a plump in the bread basket, or the victualling office; I'll give you a blow in the stomach. [Grose, "Dictionary of the Vulgar Tongue," London, 1785]
Or, even if any of them should suspect me, I know how to bring myself off. It is but pretending to be affronted, stripping directly, challenging him to fight, and before he can be on his guard, hitting him a plump in the bread-basket, that shall make him throw up his accounts; and I'll engage he will have but very little stomach to accuse me after. ["The Reverie: or A Flight to the Paradise of Fools," London, 1763]