An instance of diverting a conversation or debate from its original topic.
Synonym of derailer: A device placed on railway tracks in order to cause a train to derail.
To cause to deviate from a set course or direction.
To cause to come off the tracks.
To come off the tracks.
To deviate from the previous course or direction.
To successfully convince (someone) to agree to, accept, or do something, usually through reasoning and verbal influence.