挺身而出

zài wēi jí shí kè tā zǒng tǐng shēn ér chū

在危急时刻她总挺身而出。

She has always been to the fore at moments of crisis.

nán dào tā yǐ wéi tā de péng you men bù huì tǐng shēn ér chū ma

难道他以为她的朋友们不会挺身而出吗？

Could he expect that her friends would not step forward?

tā zài yī dà qún rén miàn qián tǐng shēn ér chū

他在一大群人面前挺身而出。

He got up in front of the huge crowd.