Overbill is defined as to charge someone too much.
An example of overbill is to charge someone $30 for an $18 meal.
to bill (someone) for charges in excess of the amount to which one is entitled
(third-person singular simple present overbills, present participle overbilling, simple past and past participle overbilled)
- To bill an excessive amount, particularly an amount greater than one is legally entitled to.
- The company was found to have systematically overbilled its customers.
over- +"Ž bill