This is the 1931st most frequent Korean word.
달린
"달린" means "ran" or "attached," depending on context.
In this sentence, '달린' is the past attributive form of '달리다' (to run), describing the child who exerted effort in running.
열심히 달린 아이가 상을 받았어요.
The child who ran hard received an award.
Here, '달린' is used in the sense of 'being attached or mounted,' illustrating its attributive form of the verb '달리다' (to be attached).
자동차에 달린 장비를 점검하세요.
Check the equipment installed on the car.
In this context, '달린' relates to the concept of having something attached or connected, specifically wings on animals, and it functions attributively to describe the animals.