underspend - definition and synonyms

verb [intransitive/transitive] 

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/ˌʌndə(r)ˈspend/
present tense
I/you/we/theyunderspend
he/she/itunderspends
present participleunderspending
past tenseunderspent
past participleunderspent
  1. to spend too little money on something, or to spend less than you expected