君子之交jūn zǐ zhī jiāojunzizhijiaofriendship between gentlemen, insipid as water (idiom, from Zhuangzi 莊子|庄子[Zhuang1 zi3])Characters in this word之marks preceding phrase as modifier of following phrase交to connect君sovereign, ruler, prince, monarch, chief子son, childStudy it in Yanamino