Going down, physically: 1층 어디예요? 어떻게 내려가죠? 'where's the ground floor, how do I get down?', [이렇게 내려갔다가 한번]. A level dropping uses the same verb — 기온이 갑자기 크게 내려가면서 이제 너무 추울 거다 'the temperature will fall sharply.' The manner word is usually 이렇게 or 어떻게, because the speaker is either pointing at the route or asking for it. It is the mirror of 게 올라가다.