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on the up (and up)

Definition

mainly US informal describes someone who is honest and can be trustedHonesty, openness and sincerityLoyal, faithful and dependable UK improving all the time: Her career has been on the up and up since she moved into sales.Becoming betterMaking things betterMaking progress and advancing
(Definition of on the up (and up) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)