on (one's) mettle

(redirected from on my mettle)

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

on (one's) mettle

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