belittle - definition and synonyms

verb [transitive] 

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/bɪˈlɪt(ə)l/
present tense
I/you/we/theybelittle
he/she/itbelittles
present participlebelittling
past tensebelittled
past participlebelittled
  1. to say or think that someone or something is unimportant or not very good

    You shouldn’t belittle her achievements.