Last Updated：2025/11/23
The operating of a new engine (especially that of a motor vehicle) at less than its normal speed until proper working has been established.
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running in
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Source Word
running in
Noun
uncountable
Japanese Meaning
新しいエンジンを適正な動作状態に慣らすため、通常の速度より低速で運転する行為（試運転、慣らし運転）
