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/ˌdəˈɹeɪl.jə/ · noun
The mechanism on a bicycle used to move the chain from one sprocket (gear) to another..
The common rear derailleur designs all operate on the same principle. A moveable cage receives the chain returning from the chainwheel and directs it onto one sprocket of the cluster.
Use derailleur when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Derailleur means The mechanism on a bicycle used to move the chain from one sprocket (gear) to another..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
The common rear derailleur designs all operate on the same principle. A moveable cage receives the chain returning from the chainwheel and directs it onto one sprocket of the cluster.
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