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From 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]