a hard nut to crack

a hard/tough nut to crack

a difficult problem to solve A company whose product has sold well in the States may find the European market a tougher nut to crack.

Name	Pronounced	Usage
Seonag	SHO-nahk	Scottish
Wyatt	WIE-ət	English
Johan	YOO-ahn (Swedish)	Swedish, Norwegian, Danish, Dutch
Stepane	-	Georgian
Nita	['ni:tə]
Love (1)	LOO-ve	Swedish