半面之旧

Explanation: One side: met; old: Originally, the idea was old friends. The old one that met only once 　　Usage: Partial official; as object, attribute; containing derogatory 　　Source: Bai Tang "and the element nine books": "Scholars should be the beginning, the DPRK of non-pro-hemp linen, no half of a high official of the old." 　　Examples: Scholars should be the beginning of time, the pro-North Korea without linen hemp, Sheriff no ~. (Tang Bai "and nine per book") Thesaurus:  a once-met acquaintance, side retain Antonym Group:  Clever people like clever people, Like knows like.