갈아내다: 갈아내다 replace ; substitute ; take out an old one (with intent to replace). 묵은 기와를 ~ get one's roof retiled. 깨진 그릇을 갈아내고 새것을 들이다 change a cracked bowl for a complete one.
막아내다: 막아내다 keep away[out / off / back]; hold in check; hold off; ward off ; [방어하다] defend ; protect . 적을 ~ hold the enemy in check / check the enemy's onslaught. 추위를 ~ protect oneself from the cold / keep
맡아내다: sniff; taste; hear; feel; listen; smell; whiff; sense
예문
An agent gave his life to tell us that. 우리쪽 요원이 그걸 알아내다 목숨을 잃었다