Pronunciation: (met'l), [key]
1. courage and fortitude: a man of mettle.
2. disposition or temperament: a man of fine mettle.
3. on one's mettle, in the position of being incited to do one's best The loss of the first round put him on his mettle to win the match.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.