diminish

[1]	decrease , decrease , lessen , decline , abate , fall , lessen , reduce , lower , shrink , curtail , contract , lop , crop , dock , clip , prune , cut , truncate , cut down , abbreviate , shorten , abridge , compress , condense , pare (down) , scale down , boil down
[2]	belittle , belittle , disparage , degrade , downgrade , discredit , detract (from) , vitiate , debase , deprecate , demean , derogate , depreciate , vilipend , devalue , cheapen , put down , dismiss , humiliate , demean , reject
[3]	wane , fade , dwindle , ebb , die out/away , peter out , recede , subside , slacken , let up , wind down , slow (down) , ease (off) , (Colloq) run out of steam