overbite n.

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.), oversmall (mid-13c.), overshort, etc.

late Old English bite, "a biting, an act of piercing with the teeth;" c. 1200, "a mouthful, a morsel of food," from Proto-Germanic bitiz (source also of Old Frisian biti "a bite, a cut, penetration of a weapon," Old Norse bit "a bite," Old Saxon biti, Middle Dutch bete "a bite, bit"), from the source of bite (v.). It is attested from early 15c. as "a mark left by biting," by 1865 as "the catch or hold of one mechanical part on another."