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French word couloir comes from French couler, French -oir
couler (French)
(intransitive) to flow, to run; to slip, to skid. (intransitive) to go bankrupt. (intransitive) to shed (i.e. shed blood). (intransitive) to sink. (transitive) to cast (metal); to pour (liquid). (transitive) to sink. (transitive, Quebec) to fail, flunk (a course, test, etc.).
-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.
couloir (French)
Aisle (in an airliner). Corridor.