하다가

하다가

"하다가" means "while doing" or "in the middle of doing."

The word '하다가' is used to indicate an interruption or a change of state occurring during the course of the action described earlier in the sentence, which is '운동을 하다'.

운동을 하다가 다쳤어요.

I got injured while exercising.

Here, '하다가' signifies the transition from actively reading to unexpectedly falling asleep during that action.

책을 읽다가 잠이 들었어요.

I fell asleep while reading a book.

In this sentence, '하다가' is used to show a sudden occurrence, meeting a friend, during the ongoing act of walking.

길을 걷다가 친구를 만났어요.

I ran into a friend while walking on the road.