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detour (n.)

1738, from French détour, from Old French destor "side road, byway; evasion, excuse," from destorner "turn aside," from des- "aside" + tourner "to turn" (see turn (v.)).

detour (v.)

1836 (intransitive); 1905 (transitive), from detour (n.). Related: Detoured; detouring.