undercharge

verb (used with object), un·der·charged, un·der·charg·ing.

1. to charge (a purchaser) less than the proper or fair price.
2. to charge (a stated amount) less than the proper price: They undercharged several dollars for storing the goods.
3. to put an insufficient charge or load into.

verb (used without object), un·der·charged, un·der·charg·ing.

4. to charge too little.

noun

5. a charge or price less than is proper or customary.
6. an insufficient charge or load.

verb

1. to charge too little (for)
2. (tr) to load (a gun, cannon, etc,) with an inadequate charge

noun

3. an insufficient charge