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jump the track

Suddenly switch from one thought or activity to another. For example, Joe was describing his trip to Australia and, jumping the track, began complaining about the airline, or They couldn't decide on the next step and now the whole reorganization plan has jumped the track. This expression alludes to a train going off the rails. [Colloquial; early 1900s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.