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English definition of “mettle”

mettle

noun [U]     /ˈmet.l̩/ US  /ˈmet̬-/
ability and determination when competing or doing something difficult: The German athletes showed/proved their mettle in the final round. The real test of her political mettle came in the May elections.Strength of will and determination
(Definition of mettle noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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