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derailleur

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derailleur/dɪˈreɪlɚ/noun
pluralderailleurs
derailleur
/dɪˈreɪlɚ/
noun
pluralderailleurs
Learner's definition of DERAILLEUR  
[count]
: a part on a bicycle that is used to change gears by moving the chain from one gear to another one
— see picture at bicycle
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