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는 않았다

did not; was not

→ 는
phrase Uncommon #6,959
did not; was not Attached to a verb or adjective, 는 adds contrast or emphasis to the negative past form.
KO: 비가 오지는 않았다.
EN: It didn’t rain.

레인슨 에게는 비서가 한 명 뿐 이었는데, 정문에서 그의 사무실까지 가는 길을 막지는 않았다.

Rainsen had only one secretary, but that didn’t stop him from making his way from the main entrance to his office.

선원들은 딱히 웃지는 않았다.

The sailors didn’t exactly laugh.