c. 1300, overchargen, "to overload, overburden, load (something) too heavily," from over- + charge (v.). Meaning "to charge someone too much money, demand an excessive price from" is from 1660s. Related: Overcharged; overcharging.
word-forming element meaning variously "above; highest; across; higher in power or authority; too much; above normal; outer; beyond in time, too long," from Old English ofer (from PIE root *uper "over"). Over and its Germanic relations were widely used as prefixes, and sometimes could be used with negative force. This is rare in Modern English, but compare Gothic ufarmunnon "to forget," ufar-swaran "to swear falsely;" Old English ofercræft "fraud."
In some of its uses, moreover, over is a movable element, which can be prefixed at will to almost any verb or adjective of suitable sense, as freely as an adjective can be placed before a substantive or an adverb before an adjective. [OED]
Among the old words not now existing are Old English oferlufu (Middle English oferlufe), literally "over-love," hence "excessive or immoderate love." Over- in Middle English also could carry a sense of "too little, below normal," as in over-lyght "of too little weight" (c. 1400), overlitel "too small" (mid-14c.), overshort, etc.
early 13c., "to load, put a burden on or in; fill with something to be retained," from Old French chargier "to load, burden, weigh down," from Late Latin carricare "to load a wagon or cart," from Latin carrus "two-wheeled wagon" (see car).
Senses of "entrust," "command," and "accuse" all emerged in Middle English and were found in Old French. Sense of "rush in to attack, bear down upon" is from 1560s, perhaps through earlier meaning "load a weapon" (1540s). Meaning "impose a burden of expense" is from mid-14c. That of "to fix or ask as a price" is from 1787; meaning "hold liable for payment, enter a debt against" is by 1889. Meaning "fill with electricity" is from 1748. Related: Charged; charging.
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Harper, D. (n.d.). Etymology of overcharge. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/overcharge