Abate

Abate-v
1- (vti) to lessen or make something lessen gradually (formal or literary)
2- (vti) to suppress or end a nuisance, act, or writ
3- (vt) to lower the amount or rate of something such as a tax (formal)

Synonyms
decrease
subside
grow less
decline
fade away
fall
stop
halt
end
terminate
rise (antonym)