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racing (of an engine); idling
going in circles (of an argument, discussion, etc.); spinning one's wheels; going nowhere
雪道でタイヤが空転して進めなかった。
The tires spun on the snowy road and we couldn't advance.
議論が空転し結論は持ち越しとなった。
The discussion went in circles and the conclusion was carried over.
エンジンが空転する音が響いていた。
The sound of the engine idling echoed.