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
Herberto	er-BER-to (Spanish)	Spanish, Portuguese
Carr	[ka:]
Frannie	FRAN-ee	English
Waheeda	-	Arabic
Tomos	TAW-maws	Welsh
YasemİN	yah-se-MEEN	Turkish