Yours, Etc.: Origins and Uses of 8 Sign-Offs
c.1300, "to go along with;" late 14c., "to carry, transport;" from Anglo-French conveier, from Old French convoier "to escort" (Modern French convoyer), from Vulgar Latin *conviare "to accompany on the way," from Latin com- "together" (see com-) + via "way, road" (see via). It was a euphemism for "steal" 15c.-17c., which helped broaden its meaning. Related: Conveyed; conveying.