This is the 158th most frequent Hindi word.
up
The Hindi word "up" does not exist. If you mean "ऊप" or any specific term, please clarify.
Here, 'up' is used to describe completing the action of awakening.
वह जल्दी सुबह उठी।
She woke up early in the morning.
In this context, 'up' emphasizes the completion or thoroughness of the action of opening.
किसी ने दरवाजा खोल दिया।
Someone opened up the door.
'Up' is used metaphorically to describe a positive improvement in mood.