我知道你深浅我知道你长短
[wŏ zhī dào nĭ shēn qiăn wŏ zhī dào nĭ zhăng duăn]
Translating to 'I know your strengths and weaknesses, I know your ups and downs', this suggests familiarity with someone’s entire personality including both positive and negative traits. It indicates deep knowledge and understanding of another person.