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줄 알아야지

should know

→ 줄
phrase Rare #19,325
should know In admonishing expressions like 부끄러운 줄 알아야지, it means someone should recognize or feel the preceding thing. With an action verb, it can mean “should know how to.” The ending is informal.
KO: 그 정도는 할 줄 알아야지.
EN: You should know how to do at least that much.

부끄러운 줄 알아야지!

You should be ashamed!

— 자전거 도둑 (1948)

신 무서운 줄 알아야지

You should know to fear God.

— 피케이: 별에서 온 얼간이 (2014)

데미언, 네 돌아가신 부모님 께 부끄러운 줄 알아야지

Damien, you should be ashamed of yourself in front of your late parents.

— 보리밭을 흔드는 바람 (2006)

적당히 즐길 줄 알아야지

You have to know how to enjoy yourself in moderation.

— 8과 1/2 (1963)