NUT
Meaning of NUT in English
n.
1) to crack a ~
2) to shell ~s
3) ( misc. ) a hard/tough ~ to crack ('a difficult problem to deal with')
The Bbi combinatory dictionary of English, a guide to word combinations.
Комбинаторный словарь английского языка Bbi. Руководство по словосочетаниям.
2012