can't cut the mustard

(British, American & Australian) also can't cut it (British)

if you can't cut the mustard, you cannot deal with problems or difficulties If she can't cut the mustard, we'll have to find someone else to do the job.

Common Names:

Name	Pronounced	Usage
InÈS	ee-NES	French
Akhenaten	ah-kə-NAH-tən (English)	Ancient Egyptian
Sergio	SER-jo (Italian), SER-khyo (Spanish)	Italian, Spanish
Jackin	-	Medieval English
Calvus	-	Ancient Roman
Ahmed	-	Turkish, Bosnian, Arabic, Urdu, Pashto