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말아야 할

should not

→ 말다
phrase Uncommon #10,104
should not Used before a noun to describe something that should not be done or forgotten.
KO: 우리가 잊지 말아야 할 약속이에요.
EN: It’s a promise we shouldn’t forget.

다시 돌아가지 말아야 할 텐데

I really shouldn’t go back.

— 400번의 구타 (1959)