Definitions from Wiktionary (derailer)

▸ noun:  One who, or that which, derails.
▸ noun:  (rail transport) Synonym of derail: A device placed on railway tracks in order to cause a train to derail.
▸ noun:  (cycling, uncommon) Alternative form of derailleur. [The mechanism on a bicycle used to move the chain from one sprocket (gear) to another.]


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