run idle meaning in English

空转

The engine is running idle
发动机在空转着。
When making the sewing machine run idle , remove the bobbin case and the bobbin since there is the possibility that thread is entangled in the hook
让缝纫机空转时，有可能机线空绕而卷绕不到旋锁上，因此请卸下梭壳和梭芯。
Make the sewing machine run idle for approximately 30 seconds after adjusting with the adjust pin , insert a sheet of paper for confirming the oil amount ( oil spots ) from the direction of arrow mark , and confirm that the amount of oil is adequate
用油量调节销调整后，请进行30秒左右的空运转，按照箭头方向插入确认油量(油迹)专用纸确认油量是否适量。