| 释义 | idiomonceonce and for all(also once for all BrE)1 change/make sth different if you deal with or decide something once and for all, you finish dealing with it or make a final decision about it:We should support any political solution, as long as it solves the problems of the refugees once and for all.Smokers should take this opportunity to give up their addictive habit once and for all.He is setting up a study of marine mammals, to determine once for all how badly they are being affected by pollution.2 if you say something once and for all, you say it very firmly and clearly, so that you will not have to say it again:Once and for all, I have never received any money from Valdez.The Church should declare once and for all that it does not support the regime's racist policies. 
 See:(every) once in a whileall at onceat oncebe in two places at oncecan't be in two places at onceChristmas comes but once a yeardifficult is done at once; the impossible takes a little longereven a blind pig can find an acorn once in a whileevery now and thenevery once in a whileFool me once, shame on you; fool me twice, shame on meFool me once, shame on you; fool me twice, shame on me.for oncegive (one) the once-overgive (someone/something) the once-over, togive (something) a once-overgive somebody/something a/the once-overgive someone the once-overgive someone/something the once-overgive something a once-overgive the eyeif I’ve told you once, I’ve told you a thousand timesif I've told you once, I've told you a thousand timesmeasure twice and cut oncemeasure twice, cut oncenow and thenonce (the) word gets outonce a (something), always a (something)Once a priest, always a priestonce a something, always a somethingonce a..., always a...once againonce again/once moreonce and againonce and for allonce and futureonce bitten, twice shyonce hell freezes overonce in a blue moononce in a lifetimeonce in a whileonce moreonce or twiceonce over lightlyonce the dust has settledonce too oftenonce upon a timeonce you go black, you never go backonce-in-a-lifetime chanceonce-in-a-lifetime opportunityonce-overonce-over-lightlyOne cannot be in two places at onceopportunity knocks but onceride two horses at onceride two horses at the same timeskin the bear at oncethe once-overthe pitcher will go to the well once too oftenwhen the dust has settledyou only live onceyoung onceyou're only young once
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