철이 들다

cheori deulda [처리 들다]

철이 들어요 · 철이 들었어요 · 철이 든 사람 (ㄹ drops)

to grow up, to mature, to come to one's senses

Example

군대에 다녀온 후에 아들이 철이 들었어요.

My son grew up after he came back from the military.

Word parts

Literally 'good sense comes in' — 들다 means to enter.