back to back

adverb
1.
(of two similar events) following one immediately after the other; in unbroken sequence; consecutively: After losing all day, he picked winners back to back in the last two races.
adjective Also, back-to-back.
2.
adjacent or contiguous but oppositely oriented; having the backs close together or adjoining: The seats in the day coach are back to back.
3.
Stud Poker. (of a pair) consisting of the hole card and the first upcard: He had aces back to back.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Idioms & Phrases

back to back

  1. With backs close together or touching, as in In the first and second rows of the bus, the seats were back to back, an unusual arrangement. This term also can be applied to persons who stand facing in opposite directions and with their backs touching. [Mid-1800s]

  2. Consecutively, one after another, as in I'm exhausted; I had three meetings back to back. [Mid-1900s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
Cite This Source
Example sentences
They are built in the back yard, generally back to back with the rear buildings
  on abutting lots.
When placed back to back with the tallest of the boat's crew, he tried his best
  to edge on higher ground, and to stand on tiptoe.
Had he seen the whole picture, each story nicely placed back to back, he may
  have discerned a common problem.
The back to back distance on the wheel axles was measured and also found to be
  within specifications.
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