One of the mysteries of the English language finally explained.
Excessive discharge, especially of electricity; specifically the discharge of an accumulator or storage battery beyond a certain limit, especially so as to cause damage to it.
1with object To discharge (an accumulator or storage battery) beyond a certain limit.
2no object Of an accumulator or storage battery: to discharge beyond a certain limit.
Mid 19th century; earliest use found in Scientific American. From over- + discharge<br>late 19th century (in an earlier sense). From over- + discharge.
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