a response that cites the cause or reason in the other person's statement **Spoken language.** It's much like -아서, but ends the sentence instead of continuing it. - Q: 왜 러닝 안 했어요? A: 다리 아파서요. - Why didn't you run? Because my legs hurt - Q: 민수씨는 왜 그렇게 급하게 나갔어요? A: 약속에 늦어서요. - Why did Minsoo leave in a hurry? He was late to an appointment.