lessen - definition and synonyms

verb [intransitive/transitive] 

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/ˈles(ə)n/
present tense
I/you/we/theylessen
he/she/itlessens
present participlelessening
past tenselessened
past participlelessened
  1. to become smaller in amount, level, importance etc or make something do this

    Traffic had lessened and the Mercedes was picking up speed.

    Treatment will lessen the pain.