毕其功于一役bìqígōngyúyīyìMeanings1. to accomplish the whole task at one stroke (idiom)Characters used毕to finish其his功service于to一one役forced laborExamples1如此rúcǐ复杂fùzá的de工作gōngzuò决jué不能bùnéng毕其功于一役bìqígōngyúyīyì。A complicated job like that can't be done in the blink of an eye.