Etymology
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rue (n.3)

French for "street," from Vulgar Latin *ruga (source also of Old Italian ruga, Spanish rua "street in a village"), from Latin ruga, properly "a furrow," then in Medieval Latin "a path, street," (see rugae).

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mainsail (n.)

also main-sail, in a square-rigged vessel, the sail bent to the main-yard, mid-15c., see main (adj.) + sail (n.).

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Broadway 
common street name, c. 1300 as "a wide road or street," from broad (adj.) + way (n.); the allusive use for "New York theater district" is first recorded 1881.
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tough (n.)
"street ruffian," 1866, American English, from tough (adj.).
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guttersnipe (n.)
also gutter-snipe, 1857, from gutter (n.) + snipe (n.); originally Wall Street slang for "streetcorner broker," attested later (1869) as "street urchin," also "one who gathers rags and paper from gutters." As a name for the common snipe, it dates from 1874 but is perhaps earlier.
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TriBeCa 
1983, area in Manhattan between Broadway and the Hudson, south of Greenwich Village, from "triangle below Canal (Street)."
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backstreet (n.)
mid-15c., from back (adj.), here perhaps with a sense "inferior, mean, obscure" + street.
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larrikin (n.)
"street tough, rowdy," 1868, Australia and New Zealand, of unknown origin; perhaps somehow from the masc. proper name Larry.
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mainstream (n.)
also main-stream, main stream, "principal current of a river," 1660s, from main (adj.) + stream (n.); hence, "prevailing direction in opinion, popular taste, etc.," a figurative use first attested in Carlyle (1831). Mainstream media attested by 1980 in language of U.S. leftists critical of coverage of national affairs.
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mainline (v.)

also main-line, "inject (drugs) intravenously," 1934, from main line in American English slang sense "principal vein into which drugs can be injected" (1933).

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