und‧er‧charge /ˌʌndəˈtʃɑːdʒ $ ˌʌndərˈtʃɑːrdʒ/
verb [intransitive and transitive] to charge too little or less than the correct amount of money for something
Antonym : 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. [TahlilGaran] Dictionary of Contemporary English ▲