Barack Obama and Joe Biden may now have to prove their mettle as never before.
WINNER: Harvey Weinstein Long the king of awards-circuit manipulation, Weinstein has proved his mettle once again this year.
Slate: Obama Proves His mettle The real show was behind the scenes.
But will it keep women of talent and substance and mettle and ambition from gunning it forward?
Detractors are just a test of your mettle en route to your meeting like-minds, en masse.
Texas cattle put the horse and his rider more on their mettle than these grade cattle.
The rector proved himself a competitor worthy of the minister's mettle.
Those curious words of the mysterious girl had placed me upon my mettle.
The Corsicans at Toulon were persons of importance, and had shown their mettle.
They asked questions which went to the heart of the business and put me to my mettle to answer them.
1580s, variant spelling of metal, both forms used interchangeably (by Shakespeare and others) in the literal sense and in the figurative one of "stuff of which a person is made" (1550s) until the spellings and senses diverged early 18c.