앞장서다

Meanings

be at the headTo stand in the forefront of a group.
take the lead; lead the vanTo do something as a leader.

Examples from Lessons (3)

하지만 이제 는 밖 으로 나가자 강아지 가 먼저 앞장서서 신나게 달리기 시작한다.
But now, as soon as we head outside, the puppy takes the lead and starts running excitedly.
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민지는 친구 사라의 옷매무새 를 가다듬어 주며 좁은 길 을 앞장섰다.
Minji adjusted her friend Sarah's clothes and led the way through the narrow path.
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남 보다 앞장서서 행동하며 팀원들에게 본보기 가 되는 태도 를 중요하게 여기는 것입니다.
They place great importance on an attitude of taking the lead and serving as a role model for team members.
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Grammar in These Examples

-아/어서Level 2Because of, therefore -ㄴ다/는다Level 1Plain declarative ending -게Level 3-ly (adverbial form)-(으)며Level 4And, while