공들여요 · 공들였어요 · 공들일 거예요 · 공들이세요
to put a lot of effort into, to take great pains with
Example
엄마가 공들여 만든 음식이라 더 맛있어요.
It tastes even better because Mom put so much care into making it.
Word parts
공 effort
공 'effort, merit' + native 들이다 'to put in' — investing effort.
Good to know
Often 공들여 + verb: 공들여 만들다/준비하다; also written as 공을 들이다.