turning point
n. countable B2 Upper Intermediate
n. a moment or event when a very important change starts to happen. It is the time when a situation begins to get much better or much worse.
n. a crucial moment at which a decisive change in a situation occurs, especially one with beneficial results. Refers to a figurative pivot in time or circumstance rather than a literal physical rotation.
Winning that match was the turning point for the team.
The invention of the steam engine was a major turning point in the history of human industry.
Historians often debate which specific battle served as the true turning point of the war, as several key events contributed to the eventual shift in momentum.