Here is one explanation of the orgin of "spoke" for a wheel I found:
"The term originally referred to portions of a log which had been split lengthwise into four or six sections. The radial members of a wagon wheel were made by carving a spoke (from a log) into their finished shape. Eventually, the term spoke was more commonly applied to the finished product of the wheelwright's work, than to the materials he used."
Seems history has a lot to do with how our languages change. So, location and usage are just some of the problems with maintaining complete mastery of any language, native or not.
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