turn upon (something)

phrase

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

The election will turn upon a multitude of dynamics, some too subtle to be apparent ahead of time. — Jelani Cobb, The New Yorker, 13 Oct. 2024

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