1. keep from happening or arising; make impossible;

   "My sense of tact forbids an honest answer"
   "Your role in the projects precludes your involvement in the competitive project"
   

2. act in advance of; deal with ahead of time

1.预先阻止;抢在…之前行动
If youforestall someone, you realize what they are likely to do and prevent them from doing it.

e.g. O'Leary made to open the door, but Bunbury forestalled him by laying a hand on his arm...
奥利里想去开门，但是邦伯里抢先一把摁住了他的胳膊。
e.g. Large numbers of police were in the square toforestall any demonstrations.
广场上驻守着大批警察以防止任何示威活动。

1. 预先阻止：foresight 远见,先见之明 |forestall 预先阻止 | foretell 预测

2. forestall的解释

2. 垄断：forestage 舞台幕布 |forestall 垄断 | forestation 造林

3. 防止：forced-and-induced draft fan 鼓引风机 |forestall 防止 | fouling 沾污

4. 抢先：forestage /台唇/前级/舞台台唇/ |forestall /抢先/ | forestation /造林/植林/森林管理/