Origin and history of cargo

c. 1300, "wheeled vehicle," from Anglo-French carre, Old North French carre, from Vulgar Latin *carra, related to Latin carrum, carrus (plural carra), originally "two-wheeled Celtic war chariot," from Gaulish karros, a Celtic word (compare Old Irish and Welsh carr "cart, wagon," Breton karr "chariot"), from PIE *krsos, from root *kers- "to run." The Celtic-Latin word also made it into Greek, as karron "wagon with four wheels."

"From 16th to 19th c. chiefly poetic, with associations of dignity, solemnity, or splendour ..." [OED]. Used in U.S. by 1826 of railway freight carriages and of passenger coaches on a railway by 1830; by 1862 of streetcars or tramway cars. The extension to "automobile" is by 1896, but between 1831 to the first decade of 20c. the cars meant "railroad train." Car bomb is attested from 1972, in a Northern Ireland context. The Latin word also is the source of Italian and Spanish carro, French char.

"to be weighed down or oppresssed by cares or worries, be concerned about" (archaic), early 12c., a figurative use, via Anglo-French from Old North French carkier "to load, burden," from Late Latin carcare "to load a wagon or cart," from Latin carrus "wagon" (see car). Compare Old North French carguer "charger," corresponding to Old French chargier. The literal sense in English, "to load, put a burden on," is from c. 1300. Related: Carked; carking.

Also as a noun in Middle English and after, "charge, responsibility; anxiety, worry; burden on the mind or spirit," (c. 1300), from Anglo-French karke, from Old North French form of Old French carche, variant of charge "load, burden, imposition" (source of charge (n.)).