Refers to the flow of fortune or destiny, often in a somewhat abstract or philosophical sense. Less common in everyday speech than 運 (うん) or 運勢 (うんせい).
I feel like my luck is turning.
He is good at reading the flow of fortune.
turn of good fortune; one's fortune turning for the better
Compound of 運 (うん, 'luck, fate') and 気 (き, 'spirit, energy'). The exact historical derivation is uncertain, but the combination conveys the idea of a flowing force of fortune.