idle wheelEnglishOxford New American Dictionaryidle wheel /ˈīdl ˌ(h)wēl, ˈaɪdl ˌ(h)wil/ ▸ noun an intermediate wheel between two geared wheels, especially when its purpose is to allow them to rotate in the same direction.
EnglishOxford New American DictionaryEnglishOxford New American Dictionary
EnglishOxford New American Dictionary