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The Collaborative International Dictionary
Undercharged mine

Undercharge \Un`der*charge"\, v. t.

  1. To charge below or under; to charge less than is usual or suitable fro; as, to undercharge goods or services.

  2. 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.