Wiktionary
step up to the plate
vb. (context chiefly US idiomatic English) To initiate action; to assume a responsibility.
Wikipedia
Step Up to the Plate
Step Up to the Plate is a United Kingdom-based television program, produced by Endemol, for the BBC. It was hosted by Anton du Beke and Loyd Grossman
Usage examples of "step up to the plate".
The men and women of the Twenty-sixth MEU lived for this stuff, and once again they were about to step up to the plate in service of their country.
Oh, she could probably tag one of the bridge officers to step up to the plate.
If he wanted to, he could step up to the plate and hit the ball clear out of the park.