mettle

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be on (one's) mettle

To be 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

prove (one's) mettle

To prove that one has endurance and strength of character, or the necessary skills, abilities, or traits to succeed in something. You may be the youngest lawyer in the firm, but you certainly proved your mettle in that high-profile murder case. The new CEO proved her mettle when she joined the company in 2012 and completely restructured their dying mobile phone division into the powerhouse it is today.
See also: mettle, prove

show (one's) mettle

To show that one has endurance and strength of character, or the necessary skills, abilities, or traits to succeed in something. Primarily heard in US. You may be the youngest lawyer in the firm, but you certainly showed your mettle in that high-profile murder case. The new CEO showed her mettle when she joined the company in 2012 and completely restructured their dying mobile phone division into the powerhouse it is today.
See also: mettle, show

on (one's) mettle

Prepared to accept a challenge and do one's best.
See also: mettle, on