두드리다

Meanings

knock; tapTo hit or beat something in succession, making a sound.
strike; touch someone's heartTo impress or move someone deeply.
beat wildlyTo hit something carelessly or recklessly.
guessTo do something roughly by guesswork.

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thrash; strike(slang) To beat or hit.

Examples from Lessons (3)

학생 이 교무팀 사무실 문 을 조심스럽게 두드렸습니다.
The student knocked carefully on the office door of the Academic Affairs team.
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수진은 조심스럽게 연구실 문 을 두드리고 안 으로 들어갔습니다.
Sujin carefully knocked on the lab door and went inside.
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학생 이 연구실 문 을 조심스럽게 두드리며 교수님께 질문 을 드린다.
A student carefully knocks on the lab door and asks the professor a question.
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Grammar in These Examples

-(으)며Level 4And, while -고Level 1And, and then -ㅂ/습니다Level 1Formal polite ending