over-

over-

a prefixal use of over, preposition, adverb, or adjective, occurring in various senses in compounds (overboard; overcoat; overhang; overlap; overlord; overrun; overthrow ), and especially employed, with the sense of “over the limit,” “to excess,” “too much,” “too,” to form verbs, adjectives, adverbs, and nouns (overact; overcapitalize; overcrowd; overfull; overmuch; oversupply; overweight ), and many others, mostly self-explanatory: a hyphen, which is commonly absent from old or well-established formations, is sometimes used in new coinages or in any words whose component parts it may be desirable to set off distinctly.

Origin:
Middle English; Old English ofer-. See over

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World English Dictionary
over-
 
prefix
1.  excessive or excessively; beyond an agreed or desirable limit: overcharge; overdue; oversimplify
2.  indicating superior rank: overseer
3.  indicating location or movement above: overhang
4.  indicating movement downwards: overthrow

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