I .
1.
to stand up after sitting, lying, etc.
SYN rise :
The class got up when the teacher came in.
➡ note at stand
2.
if the sea or wind gets up , it increases in strength and becomes violent
II .
get up | ˌget sb ˈup
to get out of bed; to make sb get out of bed :
He always gets up early.
Could you get me up at 6.30 tomorrow?