mit ‧ i ‧ gate /ˈmɪtəɡeɪt, ˈmɪtɪɡeɪt/ BrE AmE verb [transitive] formal
[ Date: 1400-1500 ; Language: Latin ; Origin: past participle of mitigare 'to soften' , from mitis 'soft' ]
to make a situation or the effects of something less unpleasant, harmful, or serious SYN alleviate :
Measures need to be taken to mitigate the environmental effects of burning more coal.