English version

hard-and-fast

From Longman Dictionary of Contemporary Englishhard-and-fastˌhard-and-ˈfast adjective [only before noun]  clear, definite, and always able to be used It is impossible to give hard-and-fast rules, but here are some points to consider.
Examples from the Corpus
hard-and-fastSimilarly, it is not possible for him either to give a hard-and-fast definition of Truth.There is no hard-and-fast divide between water-breathing and air-breathing animals.Clearly there are dangers involved in drawing a hard-and-fast line between the two principles of participation and identity.Mrs. Bottomley With respect to my hon. Friend, I do not believe that it is ever possible to cut a hard-and-fast line.hard-and-fast rulesThe school doesn't have any hard-and-fast rules about what children should wear.
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