Etymology: (1350–1400; ME, v. der. of forstalle, OE foresteall intervention (to defeat justice), waylaying. See fore -, stall2)
Definition of 'forestall'
Princeton's WordNet
1. (verb)prevent, forestall, foreclose, preclude, forbid keep from happening or arising; makeimpossible "My sense of tact forbids an honest answer"; "Your role in the projects precludes your involvement in the competitive project"
2. (verb)anticipate, foresee, forestall, counter act in advance of; deal with ahead of time
Definition of 'forestall'
Webster Dictionary
1. (verb)forestall to take beforehand, or in advance; to anticipate
2. (verb)forestall to takepossession of, in advance of some one or something else, to the exclusion or detriment of the latter; to get ahead of; to preoccupy; also, to exclude, hinder, or prevent, by prior occupation, or by measures taken in advance
3. (verb)forestall to deprive; -- with of
4. (verb)forestall to obstruct or stop up, as a way; to stop the passage of on highway; to intercept on the road, as goods on the way to market
Definitions of forestall 
