에다가 << 에 + 다가 에 a particle which means "on, in, at, to" or "and" 다가 is a suffix used for emphasizing the preceding word So, 에다가 means "on, in, at, to" or "and" 친구가 저녁에다가 커피까지 사 줬어요. (here 에다가 means "and") My friend bought dinner AND even coffee for me. 꽃을 사다가 부모님 댁에다가 보내드렸어요.(here 에다가 means "to") I bought flowers and sent it TO my parents. 햇볕에다가 빨래를 말리니까 잘 말라요.(here 에다가 means "in") The laundry dries up well as it was dried IN the sun.