cabbie n.

1826, "light, two- or four-wheeled horse-drawn carriage," a colloquial London shortening of cabriolet, a type of covered horse-drawn carriage (1763), from French cabriolet (18c.), diminutive of cabriole "a leap, a caper," earlier capriole (16c.), from Italian capriola "a caper, frisk, leap," literally "a leap like that of a kid goat," from capriola "a kid, a fawn," from Latin capreolus "wild goat, roebuck," from caper, capri "he-goat, buck," from PIE *kap-ro- "he-goat, buck" (source also of Old Irish gabor, Welsh gafr, Old English hæfr, Old Norse hafr "he-goat"). The carriages were noted for their springy suspensions.

Originally a passenger-vehicle drawn by two or four horses; it was introduced into London from Paris in 1820. The name was extended to hansoms and other types of carriages, then to similar-looking parts of locomotives (1851). It was applied especially to public horse carriages, then to automobiles-for-hire (1899) when these began to replace them.

alternative spelling of -y; now mostly of -y (3), but formerly of the others as well.

1907, shortening of taximeter cab (introduced in London in March 1907), from taximeter "automatic meter to record the distance and fare" (1898), from French taximètre, from German Taxameter (1890), coined from Medieval Latin taxa "tax, charge."

An earlier English form was taxameter (1894), used in horse-drawn cabs. Taxi dancer "woman whose services may be hired at a dance hall" is recorded from 1930. Taxi squad in U.S. football is 1966, said to be from a former Cleveland Browns owner who gave his reserves jobs with his taxicab company to keep them paid and available ["Dictionary of American Slang"], but other explanations ("short-term hire" or "shuttling back and forth" from the main team) seem possible.