서

at or from a place, spoken

In every one of these lines it is 에서 worn down after a location word: 여기서 is "here", 저기서 is "over there", 어디서 is "where". It marks the place an action happens or comes from — 여기서 내리셔야 해요 is "you have to get off here", 어디서 찾은 거야? is "where did you find that?". The full 에서 means exactly the same and is what you would write; the clipped 서 is what people say. It does not mark a destination — for that Korean uses 에 or 로.

Register: spoken contraction