mitigate

[1]

moderate , extenuate , palliate , temper , reduce , abate , lessen , decrease , relieve , ease , ease up (on) , relax , alleviate , remit , assuage , allay , let up (on) , slacken , slacken up (on) , tone down , lighten , appease , palliate , mollify , calm , tranquillize , soothe , placate , quiet/(Mainly Brit) quieten , still , soften , dull , blunt , take the edge off , (US) lighten up (on)