lessen (v.)
- abate
- ablate
- abrade
- abridge
- abstract
- allay
- alleviate
- amputate
- anesthetize
- appease
- assuage
- attemper
- bate
- benumb
- blunt
- chasten
- clip
- close
- color
- compress
- constrain
- consume
- control
- corrode
- crop
- crumble
- curtail
- cushion
- cut
- damp
- dampen
- de-emphasize
- deaden
- decline
- decrease
- deduct
- deflate
- deliquesce
- depreciate
- depress
- derogate
- detract
- diminish
- disparage
- dive
- downgrade
- downplay
- drain
- drop
- dull
- dwindle
- ease
- ebb
- erode
- extenuate
- extract
- fall
- foment
- ignore
- impair
- languish
- lay
- leach
- lenify
- lighten
- lower
- lull
- mince
- minify
- mitigate
- moderate
- modulate
- mollify
- numb
- obtund
- pad
- palliate
- pare
- plummet
- plunge
- poultice
- purify
- reduce
- refine
- relieve
- remove
- restrain
- retrench
- sag
- salve
- shorten
- shrink
- simplify
- sink
- slacken
- slake
- smother
- sober
- soft-pedal
- soften
- soothe
- stifle
- subdue
- subside
- subtract
- suppress
- tame
- temper
- thin
- truncate
- underplay
- varnish
- wane
- waste
- weaken
- wear
- weed
- whitewash
- withdraw