English version

a hard/tough nut to crack

From Longman Dictionary of Contemporary Englisha hard/tough nut to cracka hard/tough nut to cracka difficult problem or situation Celtic have lost only once this season and will be a tough nut to crack. nut
Examples from the Corpus
a hard/tough nut to crackWest Ham will be a tough nut to crack especially with big Lee in good form at the moment.Daytime television is a tough nut to crack. New shows have to be good enough to beat the old favorites.Already highly successful in popular music, dance and commercial television, blacks have found the movies a tougher nut to crack.Beverley was a tougher nut to crack.
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