幸運 (kōun) means “good luck” | MotiTan Japanese Dictionary

More examples

彼は思いがけない幸運に恵まれました。kare wa omo i ga ke na i kō un ni megu ma re ma shi ta

He was blessed with unexpected good luck.

It refers to the helpful turn of events that makes success or another favorable result more likely.

運un: The chance or circumstances that bring a good or bad result.
ツキtsuki: A state of good luck, often used in casual speech.

成功やよい結果をもたらす、恵まれた運。sei kō ya yo i kek ka o mo ta ra su megu ma re ta un

The Sino-Japanese word 幸運 (kōun) is made from 幸 (kō, "happiness") and 運 (un, "luck or fortune"), whose meanings combine into good luck.

In conversational Japanese, 幸運 (kōun) sounds more formal than everyday expressions for being lucky.