off the track

off the track idiom
Away from one's objective, train of thought, or a sequence of events, It is often put as get or put or throw off the track, as in Your question has gotten me off the track, or The interruption threw Mom off the track and she forgot what she'd already put into the stew. This term comes from railroading, where it means “derailed.” Its figurative use was first recorded in 1875.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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