jump the track

[jump the track] {v. phr.} 1. To go off rails; go or run the wrongway.

The train jumped the track and there was a terrible accident.

The pulley of the clothesline jumped the track and Mother's washingfell down.

2. {informal} To change from one thought or idea toanother without plan or reason; change the thought or idea you aretalking about to something different.

Bob didn't finish his algebrahomework because his mind kept jumping the track to think about thenew girl in class.

Compare: OFF THE TRACK.