相知恨晚

Pinyin: xiāng zhī hèn wǎn Usage: 主谓式；作谓语、定语；含褒义 Explanation: 相知相互了解。认识太晚了。形容新交的朋友十分投合。 Source: 《史记·魏其武安侯列传》两人相引为重，其游如父子然。相得甚欢，无厌，恨相知晚也。” Thesaurus:  hate Bosom friend evening, regret not to have known sb. before, hate Meet evening, acquaintance to regret that something happened too late Antonym Group:   remain aloof from each other though associated till the hair is white, Old age and the new