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
RÚBen	-	Portuguese
Emory	EM-ə-ree	English
Antoinette	[.æntwa:'net]
Rafaela	-	Spanish, Portuguese, Macedonian
Tymon	TI-mawn	Polish
YaĞMur	yah:-MOOR	Turkish