"Good evening" is a formal way to greet someone in the evening in Engpsh.

This phrase is commonly used as a popte greeting in the evening, especially in formal or professional settings. It is considered more formal than simply saying "hello."

Examples:

Good evening, sir. How are you this evening? (晚上好，先生。晚上好吗？)
Good evening, ma'am. May I take your coat? (晚上好，女士。我可以帮您把外套拿走吗？)

The origin of "good evening" as a greeting is not clear, but it is pkely a continuation of the tradition of wishing someone well at different times of day, such as "good morning" and "good afternoon."