To put one on one's mettle

Harassed by repeated acts of injustice, he decided to <u><em>put his foot down</em></u>.

The boy <u><em>turned a deaf ear</em></u> to the pleadings of all his well-wishers.

Rahul fought <u><em>tooth and nail</em></u> to save his company.

He is always <u><em>picking holes in every</em></u> project.

The sight of the accident made my<u><em>flesh creep</em></u>.

The rebels <u><em>held out</em></u> for about a month

Honesty is <u><em>at a discount</em></u>, where corruption is the rule.

He is a <u><em>queer fish</em></u>, I have failed to understand him.