1.
used to politely get sb's attention, especially sb you do not know :
Excuse me, is this the way to the station?
2.
used to politely ask sb to move so that you can get past them :
Excuse me, could you let me through?
3.
used to say that you are sorry for interrupting sb or behaving in a slightly rude way :
Guy sneezed loudly. 'Excuse me,' he said.
4.
used to disagree politely with sb :
Excuse me, but I don't think that's true.
5.
used to politely tell sb that you are going to leave or talk to sb else :
'Excuse me for a moment,' she said and left the room.
6.
( especially NAmE ) used to say sorry for pushing sb or doing sth wrong :
Oh, excuse me. I didn't see you there.
7.
excuse me? ( NAmE ) used when you did not hear what sb said and you want them to repeat it