亏 (kuī): Mất tiền (money)

This investment made him lose a lot of money, and he regretted not listening to his friend's advice.

The store lost its capital because it stocked too much and couldn't sell the goods.

He always lost money in business, and in the end he had to close down.

Playing the stock market is risky; you might gain or you might lose, so don't invest all your savings.

This company lost five million last year, but this year it finally started making a profit.