lessen

decrease diminish fall minify subside

alter change change magnitude modify weaken

abate abbreviate abridge belittle boil down break bring down circumscribe concentrate confine contract cut cut back cut down decelerate decline decoct decrescendo de-escalate deflate depreciate devaluate devalue die away diminish drop off dwindle dwindle away dwindle down ease off ease up flag fly foreshorten go down let up limit lour lower minimise minimize mitigate pare pare down reduce relax remit retard shorten shrink shrivel shrivel up slack slack off slack up slacken slacken off slake slow slow down slow up step down suppress taper thin out trim trim back trim down turn down undervalue vanish vaporize wane weaken wither