be on mettle



be on your mettle

  (slightly formal)
to be determined to prove that you are good at something, especially in a difficult situation It's a tough interview - you'll have to be on your mettle.
See also: mettle, on

Common Names:

NameGenderPronouncedUsage
Mesut-Turkish
Akakios-Greek, Ancient Greek
Rajab-Arabic
HamİT-Turkish
QueenieKWEEN-eeEnglish
Secundinus-Ancient Roman