[de.tour] n [F detour, fr. OF destor, fr. destorner to divert, fr. des- de- + torner to turn--more at turn] (1738): a deviation from a direct course or the usual procedure; esp: a roundabout way temporarily replacing part of a route
[2]detour vi (1836): to proceed by a detour "~ around road construction" ~ vt 1: to send by a circuitous route
2: to avoid by going around: bypass