무릎을

knees

→ 무릎
phrase Rare #20,460
knees 무릎 means “knee,” and 을 is the object particle. 무릎을 꿇다 means “to kneel,” literally “to bend one’s knees.”
KO: 계단을 내려가다가 무릎을 다쳤어요.
EN: I hurt my knee while going down the stairs.

무릎을 다쳤나

I think I hurt my knee.

— 퍼니 게임 (1997)