Foment – English Flashcard for Foment with Synonyms Updated: September 30, 2020 by Dr. Mohammad Hossein Hariri AslFomentFoment (verb) /fəʊˈment/to cause trouble or rebellion – stir up trouble – instigate – stimulate – incite – provoke – whip up:The trial found him guilty of fomenting armed rebellion against the government.