Wordnet 3.0
NOUN (2)
1. 
 a price that is too low; 
2. 
 an insufficient charge; 
VERB (1)
1. 
 charge (someone) too little money; 
The Collaborative International Dictionary of English v.0.48:
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]
The Collaborative International Dictionary of English v.0.48:
Undercharge \Un"der*charge`\, n.
   A charge that is less than is usual or suitable.
   [1913 Webster]
WordNet (r) 3.0 (2006):
undercharge
    n 1: a price that is too low
    2: an insufficient charge
    v 1: charge (someone) too little money [ant: fleece, gazump,
         hook, overcharge, pluck, plume, rob, soak,
         surcharge]