When using the term idler, the meaning depends entirely on whether you are talking about human behavior or machinery. In everyday speech, an idler describes someone who is lazy, indolent, or avoids productive labor. In mechanical engineering, an idler is a vital rotating pulley or gear mounted inside an engine or conveyor system to guide drive belts, reduce friction, absorb slack, and route power transmission efficiently around surrounding components. You can verify these definitions through industrial catalogs and standard English dictionaries.
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