Etymology
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detour (n.)

"a roundabout or circuitous way," 1738, from French détour, from Old French destor "side road, byway; evasion, excuse," from destorner "turn aside," from des- "aside" (see dis-) + tourner "to turn" (see turn (v.)). In 18c. usually figurative. Usually treated as a French word in English (with italics and the accent mark) until late 19c.

detour (v.)

1835, "make a detour" (intransitive); 1897, "send on a detour" (transitive), from detour (n.). Related: Detoured; detouring.

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Definitions of detour
1
detour (v.)
travel via a detour;
2
detour (n.)
a roundabout road (especially one that is used temporarily while a main route is blocked);
Synonyms: roundabout way
From wordnet.princeton.edu