undercharge - definition and synonyms

verb [intransitive/transitive] 

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/ˌʌndə(r)ˈtʃɑː(r)dʒ/
present tense
I/you/we/theyundercharge
he/she/itundercharges
present participleundercharging
past tenseundercharged
past participleundercharged
  1. to sell something to someone for too low a price, or to accidentally not ask them for enough money in a shop etc