one of the thin bars or long, straight pieces of metal that connect the centre of a wheel to its outer edge, for example on a bicycle 辐条；轮辐 
Word OriginOld English spāca, of West Germanic origin; related to Dutch speek, German Speiche, from the base of the verb spike.
Idioms
put a spoke in somebody’s wheel
- (British English)
to prevent somebody from putting their plans into operation 破坏某人的计划；阻挠某人实行计划