The success of the whole structure was extremely sensitive to the size of the axle.
When we finally made it into the village, the axle on one of our trucks split in half.
This intricate sequence wrapped us around the axle more than once during design and testing in the years preceding launch.
"pole or pin upon which a wheel revolves," Middle English axel-, from some combination of Old English eax and Old Norse öxull "axis," both from Proto-Germanic *akhsulaz (cf. Old English eaxl, Old Saxon ahsla, Old High German ahsala, German Achsel "shoulder"), from PIE *aks- "axis" (see axis). Found only in compound axle-tree before 14c.