verb (used with object), verb (used without object)
to move from the main track to a siding, as a train.
to move or distract from the main subject or course.
any railroad track, other than a siding, auxiliary to the main track.

1825–35, Americanism; side1 + track Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sidetrack (ˈsaɪdˌtræk)
1.  to distract or be distracted from a main subject or topic
2.  (US), (Canadian) a railway siding
3.  the act or an instance of sidetracking; digression

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"railway siding," 1835, from side (adj.) + track (q.v.). The verb meaning "to move (a train car) onto a sidetrack" is from 1880; fig. sense of "to divert from the main purpose" is attested from 1889
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
And too many are sidetracked by politics and political correctness to offer
  comprehensive solutions.
She'd wanted to be a television personality before she got sidetracked into
  books-she was hungry for television.
Alas, he is sidetracked at a gambling emporium, where he loses all his money.
But for people of every shade, vitiligo can cause distress as strangers gawk
  and job interviews become sidetracked.
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