From Longman Dictionary of Contemporary Englishunderchargeund‧er‧charge /ˌʌndəˈtʃɑːdʒ $ ˌʌndərˈtʃɑːrdʒ/ verb [intransitive, transitive] BFto charge too little or less than the correct amount of money for something OPP overcharge The city is grossly undercharging (=charging far too little) companies to use the land.undercharge somebody by £1/$2 etc They undercharged me by about $2.→ See Verb tableFrom Longman Business Dictionaryunderchargeund‧er‧charge /ˌʌndəˈtʃɑːdʒˌʌndərˈtʃɑːrdʒ/ verb [intransitive, transitive] to charge too little or less than the correct amount of money for somethingThe city was grossly undercharging the tannery for the use of the sewage treatment plant.undercharge somebody by £10/$20 etcThey undercharged me by about two dollars. → opposite overcharge —undercharge /ˈʌndətʃɑːdʒ-dərtʃɑːrdʒ/ noun [countable]an undercharge of £15→ See Verb table