Durchhaltevermögen {n}; Courage {f}; Stehvermögen {n}; Zähigkeit {f} - mettle
in Höchstform sein - to be on one's mettle zeigen, was in einem steckt - to show one's mettle beweisen, was in einem steckt - to prove one's mettle herausfinden, was in jdm. steckt - to test sb.'s mettle: to be a test of sb.'s mettle jdn. fordern - to put sb. on his mettle