Might mean (unverified): Most difficult problem to solve.
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We found one dictionary that defines the word toughest nut to crack:

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  1. toughest nut to crack: Wiktionary

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Definitions from Wiktionary (Toughest nut to crack)

▸ noun:  Alternative form of tough nut to crack [Synonym of hard nut to crack]

Similar:
tougher nut to crack, difficult nut to crack, toughy, too-hard basket, needle-in-a-haystack, tongue twister, hardcase, time crunch, Catch-22, crunch-time, more...

Opposite:
easy task, piece of cake, simple solution

▸ Words similar to toughest nut to crack

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▸ Rhymes of toughest nut to crack

▸ Invented words related to toughest nut to crack

Similar:
tougher nut to crack, difficult nut to crack, toughy, too-hard basket, needle-in-a-haystack, tongue twister, hardcase, time crunch, Catch-22, crunch-time, more...

Opposite:
easy task, piece of cake, simple solution



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