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