* a hard nut to bite
Idiom used often by Almost Everyone
An expression used to say that something's not easy, hard to solve or to understand
"Jego choroba to twardy orzech do zgryzienia. Nie wiem, co mu jest."
"His disease is a hard nut to bite. I don't know what's wrong with him."
Added August 2020 by jimbo99724
3 out of 6 Polish speakers have heard this