- 寻开心 xúnkāixīn to make fun ofTo joke around at someone's expense or play a prank; to make fun of someone
- 穷开心 qióngkāixīn to enjoy oneself despite everythingto enjoy moments of happiness despite poverty or hardship; to find joy in a difficult situation
- 开心见诚 kāixīnjiànchéng frank and sincere(literary) to be frank and sincere; to show one's true feelings and thoughts without concealment
- 开心果 kāixīnguǒ pistachiopistachio nuts; the seed of the [[阿月浑子|阿月渾子|a1 yue4 hun2 zi5]] tree
- 开心丸儿 kāixīnwánr reassuring wordswords or actions intended to cheer someone up or provide comfort
- 开心颜 kāixīnyán to rejoiceto rejoice; to show a smiling face; to beam with joy