overspend - definition and synonyms

verb [intransitive/transitive] 

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/ˌəʊvə(r)ˈspend/
present tense
I/you/we/theyoverspend
he/she/itoverspends
present participleoverspending
past tenseoverspent
past participleoverspent
  1. to spend more money than you should or more than you intended to

derived word

overspending

noun [uncountable]