de·train I. \(ˈ)dēˈtrān\verb (-ed/-ing/-s) Etymology:de- + train, n. intransitive verb : to get off a railroad train < the tourists detrained wearily > transitive verb : to remove from a railroad train < detrained the troops and supplies as near the front as possible > • de·trainment\-mənt\noun-s II. transitive verb Etymology:de- + train (v.) : decondition 2