early 14c., "to swallow too much, to feed to repletion," probably from O.Fr. gloter "to swallow, gulp down," from L. gluttire "swallow, gulp down," from PIE base *glu- "to swallow" (cf. Rus. glot "draught, gulp"). The noun (1530s), from the verb, originally meant "a gulp;" meaning "condition of being full or sated" is 1570s; mercantile sense is first recorded 1590s.