[in the depth of night;at the dead of night] 深夜 夤夜私奔
夤缘yínyuán
[try to advance one's career by carrying favour with important people;make use of one's connections to climb up] 本指攀附上升,后喻攀附权贵,向上巴结 乔松孤立,萝茑夤缘,柔附凌云,岂曰能贤。--《旧唐书·令孤楚牛僧孺传赞》 夤缘得官 yín ㄧㄣˊ (1) 深~夜。 (2) 敬畏。 〔~缘〕攀缘上升,喻拉拢关系,向上巴结。