oh interj.

interjection expressing various emotions (fear, surprise, pain, invocation, gladness, admiration, etc.), 1530s, from Middle English o, from Old French ô, oh or directly from Latin o, oh; a common Indo-European interjection (compare Greek ō; Old Church Slavonic and Lithuanian o; Irish och, Old Irish a; Sanskrit a). But it is not found in Old English (which had ea and translated Latin oh with la or eala) or the older Germanic languages except those that probably borrowed it from Greek or Latin.

The present tendency is to restrict oh to places where it has a certain independence, & prefer o where it is proclitic or leans forward upon what follows .... [Fowler]

Often extended for emphasis, as in Oh, baby, a stock saying from c. 1918; oh, boy (by 1917); oh, yeah (1924). Reduplicated form oh-oh as an expression of alarm or dismay is attested from 1944 (as uh-oh by 1935). Oh-so "so very" (often sarcastic or ironic) is by 1916. Oh yeah? "really? Is that so?" is attested from 1930.

词汇	oh
词源	oh interj. interjection expressing various emotions (fear, surprise, pain, invocation, gladness, admiration, etc.), 1530s, from Middle English o, from Old French ô, oh or directly from Latin o, oh; a common Indo-European interjection (compare Greek ō; Old Church Slavonic and Lithuanian o; Irish och, Old Irish a; Sanskrit a). But it is not found in Old English (which had ea and translated Latin oh with la or eala) or the older Germanic languages except those that probably borrowed it from Greek or Latin. The present tendency is to restrict oh to places where it has a certain independence, & prefer o where it is proclitic or leans forward upon what follows .... [Fowler] Often extended for emphasis, as in Oh, baby, a stock saying from c. 1918; oh, boy (by 1917); oh, yeah (1924). Reduplicated form oh-oh as an expression of alarm or dismay is attested from 1944 (as uh-oh by 1935). Oh-so "so very" (often sarcastic or ironic) is by 1916. Oh yeah? "really? Is that so?" is attested from 1930. Entries linking to oh O fifteenth letter of the alphabet, from a character that in Phoenician was called 'ain (literally "eye") and represented "a very peculiar and to us unpronounceable guttural" [Century Dictionary]. The Greeks also lacked the sound, so when they adopted the Phoenician letters they arbitrarily changed O's value to a vowel. (Thus there is no grounds for the belief that the form of the letter represents the shape of the mouth in pronouncing it.) The Greeks later added a special character for "long" O (omega), and the original became "little o" (omicron). In Middle English and later colloquial use, o or o' can be an abbreviation of on or of, and is still literary in some words (o'clock, Jack-o'-lantern, tam-o'-shanter, cat-o'-nine-tails, will-o'-the-wisp, etc.). O' the common prefix in Irish surnames is from Irish ó, ua (Old Irish au, ui) "descendant." The "connective" -o- is the usual connecting vowel in compounds taken or formed from Greek, where it often is the vowel in the stem. "[I]t is affixed, not only to terms of Greek origin, but also to those derived from Latin (Latin compounds of which would have been formed with the L. connecting or reduced thematic vowel, -i), especially when compounds are wanted with a sense that Latin composition, even if possible, would not warrant, but which would be authorized by the principles of Greek composition." [OED] As "zero" in Arabic numerals it is attested from c. 1600, from the similarity of shape. Similarly the O blood type (1926) was originally "zero," denoting the absence of A and B agglutinogens. As a gauge of track in model railroads, by 1905. For o as an interjection of fear, surprise, joy, etc., see oh. The use of the colloquial or slang -o suffix in wino, ammo, combo, kiddo, the names of the Marx Brothers, etc., "is widespread in English-speaking countries but nowhere more so than in Australia" [OED]. oho interj. exclamation expressing surprise, c. 1400, from o (see oh) + ho (interj.). ow interj. 14c. as an exclamation of surprise; by 1895 as an expression of sudden pain. Compare oh, ah, ouch. updated on August 25, 2019
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oh interj.

Entries linking to oh