understate - definition and synonyms

verb [transitive] 

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/ˌʌndə(r)ˈsteɪt/
present tense
I/you/we/theyunderstate
he/she/itunderstates
present participleunderstating
past tenseunderstated
past participleunderstated
  1. to say that something is less important, serious, big etc than it really is