Definition of "Gulp" :

noun: a large and hurried swallow

"He finished it at a single gulp."

noun: a spasmodic reflex of the throat made as if in swallowing

verb: utter or make a noise, as when swallowing too quickly

"He gulped for help after choking on a big piece of meat."

verb: to swallow hurriedly or greedily or in one draught

"The men gulped down their beers."