'Undercharge' definitions:

Definition of 'undercharge'

noun

A price that is too low

noun

An insufficient charge

verb

Charge (someone) too little money [ant: fleece, gazump, hook, overcharge, pluck, plume, rob, soak, surcharge]

From: GCIDE

Undercharge \Un"der*charge`\, n. A charge that is less than is usual or suitable. [1913 Webster]

From: GCIDE

Undercharge \Un`der*charge"\, v. t.
1. To charge below or under; to charge less than is usual or suitable for; as, to undercharge goods or services. [1913 Webster]
2. To put too small a charge into; as, to undercharge a gun. [1913 Webster]
Undercharged mine (Mil.), a mine whose crater is not as wide at top as it is deep. --W. P. Craighill. [1913 Webster]