Definition of lessen verb from the Oxford Advanced Learner's Dictionary

 

lessen

 verb
verb
BrE BrE//ˈlesn//
 
; NAmE NAmE//ˈlesn//
 
[intransitive, transitive]Verb Forms present simple I / you / we / they lessen
BrE BrE//ˈlesn//
 
; NAmE NAmE//ˈlesn//
 
he / she / it lessens
BrE BrE//ˈlesnz//
 
; NAmE NAmE//ˈlesnz//
 
past simple lessened
BrE BrE//ˈlesnd//
 
; NAmE NAmE//ˈlesnd//
 
past participle lessened
BrE BrE//ˈlesnd//
 
; NAmE NAmE//ˈlesnd//
 
-ing form lessening
BrE BrE//ˈlesnɪŋ//
 
; NAmE NAmE//ˈlesnɪŋ//
 
 
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to become or make something become smaller, weaker, less important, etc. synonym diminish The noise began to lessen. lessen something to lessen the risk/impact/effect of something They gave her an injection to lessen the pain.Extra examples Regular exercise can help lessen the pain. Time had gradually lessened the pain of her grief. Too much background detail tends to lessen the impact of the central image.
See the Oxford Advanced American Dictionary entry: lessen