swallowing in one gulp; downing; mouthful; bite
Refers to consuming something in a single swallow or bite. Often used with で or as a counter-like noun.
He swallowed the medicine in one gulp.
sipping; sip
A small drink, often used when taking a sip of something like tea or alcohol. Less common than sense 1.
I took a sip of hot tea and felt relieved.
thinking nothing of one's opponent; making easy prey of someone
Idiomatic use: treating an opponent as if they can be swallowed in one gulp. Often appears in phrases like 一飲みにする.
The cake was small enough to eat in one bite.
He approached the match intending to make short work of his opponent.
Standard kanji spelling.
Variant using 呑む, which can emphasize drinking or swallowing whole.
Compound of 一 (one) and 飲み (drinking/swallowing, from 飲む). The idiomatic sense likely derives from the metaphor of swallowing an opponent whole.