相对相欠相见无言
[xiāng duì xiāng qiàn xiāng jiàn wú yán]
This conveys a poignant sentiment. It implies a relationship between two people who owe each other something—whether it be emotions, apologies, or unfulfilled promises—and feel so much when they meet that words become inadequate. The phrase 'owe each other' can also refer to unfinished feelings or business. The whole phrase suggests an emotional connection that is too complicated or deep to express with words.