hityoudaoicibaDictYouDict[hit 词源字典]
hit: [11] Hit is one of those words, now so common that we assume it has always been around, that is in fact a comparative latecomer to the English language, and one, what is more, whose ancestry is not at all clear. The standard Old English verb for ‘strike’ was slēan (modern English slay), but at the end of the Old English period hit suddenly appeared. It was borrowed from Old Norse hitta, a verb of unknown origin which meant not ‘strike’ but ‘come upon, find’ (as Swedish hitta still does). This sense was carried over into English (and still survives in hit upon), and it was not until the 13th century that the meaning ‘strike’ began to appear.
[hit etymology, hit origin, 英语词源]
hit (v.)youdaoicibaDictYouDict
late Old English hyttan, hittan "come upon, meet with, fall in with, 'hit' upon," from a Scandinavian source such as Old Norse hitta "to light upon, meet with," also "to hit, strike;" Swedish hitta "to find," Danish and Norwegian hitte "to hit, find," from Proto-Germanic *hitjan, of uncertain origin. Related: Hitting. Meaning shifted in late Old English period to "strike," via "to reach with a blow or missile," and replaced Old English slean in this sense. Original sense survives in phrases such as hit it off (1780, earlier in same sense hit it, 1630s) and is revived in hit on (1970s).

Underworld slang meaning "to kill by plan" is 1955 (as a noun in this sense from 1970). To hit the bottle "drink alcohol" is from 1889. To hit the nail on the head (1570s) is from archery. Hit the road "leave" is from 1873; to hit (someone) up "request something" is from 1917. Hit and run is 1899 as a baseball play, 1924 as a driver failing to stop at a crash he caused. To not know what hit (one) is from 1923.
hit (n.)youdaoicibaDictYouDict
late 15c., "a rebuke;" 1590s as "a blow," from hit (v.). Meaning "successful play, song, person," etc., 1811, is from the verbal sense of "to hit the mark, succeed" (c. 1400). Underworld slang meaning "a killing" is from 1970. Meaning "dose of narcotic" is 1951, from phrases such as hit the bottle.