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.
   1913 Webster
   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.
   
   1913 Webster
   To put one one's mettle, to cause or incite one to use one's best efforts.
   1913 Webster