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quaff (v.)

"to drink or swallow in large draughts," 1510s (implied in quaffer), a word of obscure origin, perhaps imitative, or perhaps from Low German quassen "to overindulge (in food and drink)," with -ss- misread as -ff-. Related: Quaffed; quaffer; quaffing. The noun, "act of quaffing; the amount of liquor drunk at once," is attested by 1570s, from the verb.

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Definitions of quaff from WordNet
1
quaff (v.)
to swallow hurriedly or greedily or in one draught;
Synonyms: gulp / swig
2
quaff (n.)
a hearty draft;
From wordnet.princeton.edu