step up the plate
挺身而出，承担责任
口语·鼓励勇于承担
英文释义
to take on a challenge or responsibility
例句
When our leader quit, I decided to step up the plate and take charge of the project.
典故来源
源自棒球运动，击球员从准备区走向本垒板（plate）准备击球，比喻面对挑战时主动承担责任。