We found one dictionary that defines the word difficult nuts to crack:

General (1 matching dictionary)

1. difficult nuts to crack: Wiktionary

▸ Words similar to difficult nuts to crack ▸ Usage examples for difficult nuts to crack ▸ Idioms related to difficult nuts to crack ▸ Wikipedia articles (New!) ▸ Words that often appear near difficult nuts to crack ▸ Rhymes of difficult nuts to crack ▸ Invented words related to difficult nuts to crack