충고가 · 충고를
advice, counsel (often a warning)
Example
선배의 충고를 듣고 계획을 바꿨어요.
I listened to my senior's advice and changed my plan.
Word parts
충 loyal+고 tell
Literally 'loyal telling' — honest words for someone's own good.
Good to know
충고 often points out a fault; 조언 is softer, helpful advice.
Related words