Definition of forestall verb from the Oxford Advanced American Dictionary

 

forestall

 verb
verb
NAmE//fɔrˈstɔl//
 
forestall something/somebodyVerb Forms present simple I / you / we / they forestall
 
he / she / it forestalls
 
past simple forestalled
 
-ing form forestalling
 
 
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to prevent something from happening or someone from doing something by doing something first Try to anticipate what your child will do and forestall problems. Any plans for a peaceful settlement were forestalled by the intervention of the army.
See the Oxford Advanced Learner's Dictionary entry: forestall