'Gōng xǐ' is a formal and warm expression used to convey congratulations, typically in celebratory contexts such as weddings, graduations, promotions, or the birth of a child. The character 恭 (gōng) means 'respectful' or 'reverent', while 喜 (xǐ) means 'joy' or 'happiness'; together, they literally convey 'respectful joy' — reflecting both sincerity and goodwill. It functions most commonly as an interjection (e.g., shouted cheerfully at a wedding), but can also serve as a noun meaning 'congratulations' (e.g., in phrases like '接受恭喜' — 'to receive congratulations').

This term carries positive cultural weight in Chinese-speaking communities and is deeply tied to social harmony and shared happiness. Unlike casual English 'congrats', 'gōng xǐ' is rarely used ironically or sarcastically; it's reserved for genuine, socially recognized milestones. It often appears in red envelopes, banners, and festive greetings, especially during Chinese New Year, when people say 'gōng xǐ fā cái' ('wishing you prosperity').