On the up-and-up

adj, slang

Definitions

Adjective
  1. 1
    Legitimate; honest; upright. idiomatic, informal

    "Before paying any money, make sure the organization is on the up-and-up."

  2. 2
    Becoming more successful; on the rise. UK, idiomatic, informal

Etymology

First use appears in the US c. 1863. Its exact origins are uncertain, but it is theorized to have originated in sports betting.

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