1One's luck or fortune; chance occurrences affecting events or outcomes — used in phrases like "lucky" (運がいい) or "leave it to fate".
今日は運がいいから、宝くじを買ってみようかな。
I'm lucky today, so maybe I'll try buying a lottery ticket.
彼の成功は実力もあるが、少しの運も味方した。
His success is due to ability, but a bit of luck was also on his side.
運を天に任せるのではなく、自分でできることを増やそう。
Rather than leaving things to luck, increase what you can do yourself.