cab (1)EnglishOxford New American Dictionarycab1 /kab, kæb / ▸ noun 1 a taxicab: she hailed a cab [as modifier] cab drivers. ▪ historical a horse-drawn vehicle for public hire. 2 the driver's compartment in a truck, bus, or train. ▸ verb (cabs, cabbing, cabbed) [no object] travel in a taxi: Roger cabbed home. – ORIGIN early 19th century : abbreviation of cabriolet.