Etymology
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wap (n.)
"a hit, a blow," late 14c., probably of imitative origin. The verb (late 14c.) originally meant "to throw quickly or with violence," and in slang c. 1560-1730 it meant "to copulate." Related: Wapped; wapping.
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whop (v.)
"to beat, strike," mid-15c., of imitative origin. Compare Welsh chwap "a stroke," also of imitative origin; also see wap. Related: Whopped; whopping.
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wapentake (n.)
division of certain English counties (equivalent to a hundred in other places), Old English wæpengetæc "division of a riding," from Old Norse vapnatak, from vapna, genitive plural of vapn "weapon" (see weapon) + tak "a touching, a taking hold, a grasping," from taka "to take, grasp," from Proto-Germanic *tak- (see take (v.)). Perhaps it originally was an armed muster with inspection of weapons, or else an assembly where consent was expressed by brandishing swords and spears.
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evil (adj.)

Old English yfel (Kentish evel) "bad, vicious, ill, wicked," from Proto-Germanic *ubilaz (source also of Old Saxon ubil, Old Frisian and Middle Dutch evel, Dutch euvel, Old High German ubil, German übel, Gothic ubils), from PIE *upelo-, from root *wap- "bad, evil" (source also of Hittite huwapp- "evil").

In Old English and other older Germanic languages other than Scandinavian, "this word is the most comprehensive adjectival expression of disapproval, dislike or disparagement" [OED]. Evil was the word the Anglo-Saxons used where we would use bad, cruel, unskillful, defective (adj.), or harm (n.), crime, misfortune, disease (n.). In Middle English, bad took the wider range of senses and evil began to focus on moral badness. Both words have good as their opposite. Evil-favored (1520s) meant "ugly." Evilchild is attested as an English surname from 13c.

The adverb is Old English yfele, originally of words or speech. Also as a noun in Old English, "what is bad; sin, wickedness; anything that causes injury, morally or physically." Especially of a malady or disease from c. 1200. The meaning "extreme moral wickedness" was one of the senses of the Old English noun, but it did not become established as the main sense of the modern word until 18c.

As a noun, Middle English also had evilty. Related: Evilly. Evil eye (Latin oculus malus) was Old English eage yfel. The jocular notion of an evil twin as an excuse for regrettable deeds is by 1986, American English, from an old motif in mythology.

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