PHRASAL VERB 把…一口吞下(或咽下);吞服 If you gulp down food or drink, you quickly eat or drink it all by swallowing large quantities of it at once. 把…一口吞下(或咽下);吞服
She gulped down a mouthful of coffee. [VERBPREP. noun]
她喝了一大口咖啡。
He'd gulped it down in one bite. [VERB noun PREP.]