Etymology
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serving (n.)

c. 1200, "action of serving," originally in reference to performing rites or worshipping (God or a pagan god), verbal noun from serve (v.). As "a helping of food" from 1769; earlier "the manner of carving at table" (c. 1400). Serving-board "table for serving food" is from mid-15c.

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girl (n.)

c. 1300, gyrle "child, young person" (of either sex but most frequently of females), of unknown origin. One guess [OED] leans toward an unrecorded Old English *gyrele, from Proto-Germanic *gurwilon-, diminutive of *gurwjoz (apparently also represented by Low German gære "boy, girl," Norwegian dialectal gorre, Swedish dialectal gurre "small child," though the exact relationship, if any, between all these is obscure), from PIE *ghwrgh-, also found in Greek parthenos "virgin." But this involves some objectionable philology. Liberman (2008) writes:

Girl does not go back to any Old English or Old Germanic form. It is part of a large group of Germanic words whose root begins with a g or k and ends in r. The final consonant in girl is a diminutive suffix. The g-r words denote young animals, children, and all kinds of creatures considered immature, worthless, or past their prime.

Another candidate is Old English gierela "garment" (for possible sense evolution in this theory, compare brat). A former folk-etymology derivation from Latin garrulus "chattering, talkative" is now discarded. Like boy, lass, lad it is of more or less obscure origin. "Probably most of them arose as jocular transferred uses of words that had originally different meaning" [OED]. Specific meaning of "female child" is late 14c. Applied to "any young unmarried woman" since mid-15c. Meaning "sweetheart" is from 1640s. Old girl in reference to a woman of any age is recorded from 1826. Girl next door as a type of unflashy attractiveness is recorded by 1953 (the title of a 20th Century Fox film starring June Haver).

Doris [Day] was a big vocalist even before she hit the movies in 1948. There, as the latest movie colony "girl next door," sunny-faced Doris soon became a leading movie attraction as well as the world's top female recording star. "She's the girl next door, all right," said one Hollywood admirer. "Next door to the bank." [Life magazine, Dec. 22, 1958]

Girl Friday "resourceful young woman assistant" is from 1940, a reference to "Robinson Crusoe." Girl Scout is from 1909. For the usual Old English word, see maiden.

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serving (adj.)

"that does service (to another)," c. 1300, present-participle adjective from serve (v.).

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match-girl (n.)

"girl who sells matches," 1765, from match (n.1) + girl. The tragic story of "The Little Match-Girl" (Danish title Den lille pige med svovlstikkerne) by Andersen was published in 1845, translated into English by 1847.

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Gibson girl (n.)

"woman considered stylish at the turn of the 20th century," 1894, named for U.S. artist and illustrator Charles Dana Gibson (1867-1944), whose main model was his wife, Irene Langhorne (1873-1956). The Gibson cocktail (gin, vermouth, and a pearl onion) is attested by 1914, in some stories ascribed to him but the origin of the term is unknown.

"She looks like a Gibson girl" is not an uncommon saying; and to look like a Gibson girl, is not without its merits. Although our artist has expressed in his drawings disapproval of women usurping the spheres of men, his girls suggest intellectuality. He has none of the doll-like inanely pretty faces which artists used to give women in olden days. His girls look as if they would have opinions of their own and would act with discrimination in the affairs of life. They are tall and graceful and although not in the least like fashion plates, their clothes are becoming and fit perfectly. [National Magazine, May 1898]
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self-serving (adj.)

"serving one's own (selfish) interest over other considerations," 1827, from self- + serving, present-participle adjective from serve (v.).

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call-girl (n.)

"prostitute who makes appointments by phone," 1928, from call (n.) + girl.

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Colleen 

fem. proper name, from Irish cailin "a girl, a little girl," diminutive of caile "girl, woman."

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schoolgirl (n.)

also school-girl, "girl attending a school," 1777, from school (n.1) + girl. As an adjective from 1922.

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showgirl (n.)

"An actress whose role is decorative rather than histrionic" [OED], by 1833, from show (n.) + girl. Earlier "a pretty, talented girl; girl fit to model styles or behavior," by 1816.

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