run off        
phrasal verb with run verb uk/rʌn/ us/rʌn/  running | ran | run
 突然跑掉;迅速离开
to leave somewhere or someone suddenly
  You can't run off (home) now, just when I need you! 你不能现在丢下我(回家),我正需要你! 
 My wife has run off with another man. 我妻子跟另一个男人私奔了。