This is the 405th most frequent Vietnamese word.
xong
"Xong" means "finished" or "completed."
In this sentence, 'xong' is used as a verb that means 'to finish' or 'to complete' an action, indicated by the verb that precedes it, in this case, 'học bài' ('to study').
Tôi đã học bài xong.
I have finished studying.
Here, 'xong' functions as an auxiliary verb modifying 'làm' ('to do'), indicating the completion of the action.
Khi nào bạn làm xong việc, hãy gọi tôi nhé.
When you finish your work, please call me.
In this context, 'xong' combines with 'xuôi' to form a phrase 'xong xuôi', which conveys the idea of things being completed satisfactorily and in order.