beforehand /bɪˈfɔːˌhænd/ star1 CET6 TEM4

• 1.  

  ADV（副词） If you do something beforehand, you do it earlier than a particular event. 事先; 预先

  例：

  How could she tell beforehand that I was going to go out?

  她如何预先知道我将出门的？