on the up and up

Từ điển Oxford Advanced Learner 8th

on the ˌup and ˈup idiom
(informal)
1. (BrE)becoming more and more successful
•The club has been on the up and up since the beginning of the season.
2. (NAmE) = ↑on the level ↑level _n.
•The offer seems to be on the up and up.
Main entry: ↑up_idiom