This is the 653rd most frequent Indonesian word.
usai
Finished; completed; over.
Here, 'usai' is used as a conjunction meaning 'after', indicating the sequence of events.
Saya akan pergi ke pasar usai makan siang.
I will go to the market after lunch.
In this sentence, 'usai' is an adjective meaning 'finished', describing the state of the homework.
Pekerjaan rumah saya sudah usai.
My homework is already finished.
Here, 'usai' functions as a verb meaning 'to be completed', referring to the recovery process being carried out to completion.