in order to
-(으)러 가다/오다 expresses going or coming to a place to perform an action, with the action stated first and the place second. It corresponds to '(in order) to' in English. When the verb stem ends in a vowel or ㄹ, then -러 가다/오다 is used, and when it ends in a consonant, -(으)러 가다/오다 is used.
Only movement verbs such as 가다 (to go), 오다 (to come), and 다니다 (to attend/commute) are used after -(으)러.
Furthermore, the following verbs that express movement cannot be used before -(으)러: 가다 (to go), 오다 (to come), 올라가다 (to go up), 내려가다 (to go down), 들어가다 (to enter), 나가다 (to leave), 여행하다 (to travel), and 이사하다 (to move/change residences).
Express a movement toward a location in order to perform the action. Used with verbs of movement.