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French word trottoir comes from French trotter ((usually of a horse) to trot.), French -oir
trotter (French)
(usually of a horse) to trot.
-oir (French)
A suffix forming infinitives of many verbs. A suffix used on verbs to form masculine words for objects or tools used to do something.. A suffix used on verbs to form masculine words for places where something is done.
trottoir (French)
Sidewalk (US), pavement (UK), footpath (Australia).