by one supreme effort to win eternal ease—settle a matter once and for all;do it (/away with the trouble) for good; do sth well so that one never has to do it again; get sth done(/put sth right)once and for all; work out sth efficacious for ever ? 為了～，最后我決定，把太監(jiān)全都趕走不要！ (愛新覺羅·溥儀《我的前半生》150) Finally I decided to deal with the problem once and for all by expelling all the eunuchs from the palace. ? 自買印刷機(jī)，才是～的辦法呢。(李六如《六十年的變遷》Ⅰ—171)To buy a press of our own is the only way to get rid of such trouble once and for all.
一勞永逸
achieve a permanent fix; achieve a permanent solution;settle sth once and for all
一勞永逸yī láo yǒnɡ yì
費(fèi)一次勞力就永得安逸。get sth. done once and for all, do it for good, once and for all, for good (and all), hold good for all times