on (one's) mettle


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on (one's) mettle

Determined to succeed and thus prove one's worth, often in a difficult or unpleasant situation. I know my employees think I'm too young to be their supervisor, so I have to be on my mettle every day at the office.
See also: mettle, on
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

on (one's) mettle

Prepared to accept a challenge and do one's best.
See also: mettle, on
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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