Wiktionary
prep.phr. 1 (context idiomatic English) rising; becoming greater in number or magnitude. 2 (context sports English) While the ball is rising.
Wikipedia
On the Up is a British situation comedy written by Bob Larbey. It ran for three series, from 4 September 1990 to 2 November 1992.
Usage examples of "on the up".
I was the front guy, responsible for 'do diligence,' business-speak for making sure everything was on the up-and-up.
If we run four mirrors on the same turntable with each mirror hitting its own cell so we have four cells running in parallel, that's eight hundred watts positive on the up tick to eight hundred watts negative on the down tick.
The whole was written in a large, loose-jointed, and school-boyish hand, very thin on the up strokes and thick on the down, as though care and pains had gone to the fashioning of it.