fo ‧ ment /fəʊˈment $ foʊ-/ BrE AmE verb
[ Date: 1300-1400 ; Language: Late Latin ; Origin: fomentare , from Latin fovere 'to make warm' ]
foment revolution/trouble/discord etc formal to cause trouble and make people start fighting each other or opposing the government SYN stir up :
They were accused of fomenting rebellion.
—fomentation /ˌfəʊmenˈteɪʃ ə n, -mən- $ ˌfoʊ-/ noun [uncountable]