turn upon (something)

idiom

1

: to be determined or decided by (something)

The outcome of the election turns upon how well the candidates perform in the next debate.

2

: to have (something) as a main subject or interest

The discussion turned upon the question of how the money should be spent.

Examples of turn upon (something) in a Sentence

Recent Examples on the Web

Jet Blue passengers seemed confused about the plane’s sudden turn upon landing, one traveler said. —Matt Yan, BostonGlobe.com, 28 Feb. 2023

And because fluid dynamics are never simple, the jet stream exerts its own influence in turn upon these guiding waves. —The Economist, 12 Sep. 2020