side·track

[sahyd-trak]
verb (used with object), verb (used without object)
1.
to move from the main track to a siding, as a train.
2.
to move or distract from the main subject or course.
noun
3.
any railroad track, other than a siding, auxiliary to the main track.

Origin:
1825–35, Americanism; side1 + track

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
sidetrack (ˈsaɪdˌtræk) [Click for IPA pronunciation guide]
 
vb
1.  to distract or be distracted from a main subject or topic
 
n
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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00:10
Sidetracked is always a great word to know.
So is doohickey. Does it mean:
a scrap or morsel of food left at a meal.
a gadget; dingus; thingumbob.
Etymonline
Word Origin & History

sidetrack
"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
Those who fail to meet those targets get sidetracked.
She'd wanted to be a television personality before she got sidetracked into
  books-she was hungry for television.
More work gets done because there are fewer temptations to get sidetracked.
During these years, any attempt at implementing officer training was also
  sidetracked due to the organizational crisis.
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