1580s, "to change direction" (originally with reference to the wind), from Middle French virer "to turn," of uncertain origin, perhaps from the Latin stem vir- in viriae (plural) "bracelets;" or perhaps from a Vulgar Latin contraction of Latin vibrare "to shake." Related: veered, veering.
1883, to denote the shape of the letter V. As a type of engine, by 1951.