The phrase "crucial moment" refers to an extremely important or decisive point in time or a critical juncture where an outcome or decision can have a significant impact. Full definition
The most crucial moment in potty training is the period of confinement. (snowyswan.com)
His four goals and six assists in 46 matches leave a lot to be desired, but most of his goals and assists came at crucial moments of the season. (blackwhitereadallover.com)
We all want to win, and we are not losing because of expansive football it's more down to loses of concentration at crucial moments of the game. (justarsenal.com)