This is the 1875th most frequent Korean word.
공을
The Korean word "공을" means "ball" (as the object of a verb).
Here, '공을' stands for 'a ball', which is being acted upon by being kicked (direct object of the verb '차다').
학생들이 공을 차며 놀고 있습니다.
The students are kicking a ball and playing.
In this sentence, '공을' denotes 'the ball', which is the direct object of '잡다', and refers to a specific item within the action described.
그는 던진 공을 잡았습니다.
He caught the ball that was thrown.
The use of '공을' in this context indicates the object being given ('the ball') in the transaction described by the verb '드리다'.