GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Mettle (?), n. [E. metal, used in a tropical sense in allusion to the temper of the metal of a sword blade. See Metal.] Substance or quality of temperament; spirit, esp. as regards honor, courage, fortitude, ardor, etc.; disposition; -- usually in a good sense; as, “to test a person's mettle”.
   
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   A certain critical hour which shall . . . try what mettle his heart is made of. South.
   
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   Gentlemen of brave mettle. Shak.
   
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   The winged courser, like a generous horse,
   
   Shows most true mettle when you check his course. Pope.
   
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   To put one one's mettle, to cause or incite one to use one's best efforts.
   
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