当仁不让 [- rén bú rànɡ](遇到应该做的事， 就要主动积极去做， 不推让) not pass on to others what one is called upon to do; assume such authority; never decline to do charity; not decline to shoulder a responsibility; view sth. as one's obligation; take sth. as one's obligation：
•¶ 他在荣誉面前从不伸手， 但在艰巨任务面前却当仁不让。 He never seeks credit for himself, but is always ready to take on arduous tasks.