一饮而尽yīyǐn'érjìnMeanings1. to drain the cup in one gulp (idiom)Characters used一one饮to drink而and尽to the greatest extentExamples1他tā把bǎ杯子bēizi举jǔ到dào嘴zuǐ边biān，一饮而尽yīyǐn'érjìn。He raised the glass to his lips and drained it at one gulp.