Undercharge v. t. : To charge below or under; to charge less than is usual or suitable fro; as, to undercharge goods or services.

Undercharge v. t. : To put too small a charge into; as, to undercharge a gun.

Undercharge n. : A charge that is less than is usual or suitable.

Example:
If you leave a store and the store Undercharge you, can they come after after you leave the store?

Taxonomy
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Defination from the web:
undercharge from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... undercharge. One entry found. Main Entry: un·der·charge. Pronunciation: ˌən-dər-ˈchärj Function: transitive verb. Date: 1633 : to charge ...