los {adv} - 
Es ist etwas los.  - Something is going on.; There's something going on.; There's something happening. Hier ist viel los.  - There is a lot going on here. Hier ist immer etwas los.  - There is always sth. going on here. Was ist hier los?  - What's going on here?; What's the matter here? Was ist denn mit dir los?  - What's wrong with you?; What's up with you?; What's the matter with you?