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rear-end

[reer-end]
verb (used with object)
1.
to drive a vehicle or other conveyance so as to strike the back end of (another vehicle): My car was rear-ended by another driver on the highway.
2.
(of a moving vehicle or other conveyance) to strike the back end of (another vehicle or object): A freight train rear-ended the commuter train this morning.

Origin:
1975–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To rear end
American Heritage
Idioms & Phrases

rear end

  1. The back part of anything, especially a vehicle, as in There's a large dent in the rear end of the car.

  2. The buttocks, as in I'm afraid these pants don't fit my rear end. The noun rear alone has been used in both these senses, the first since the late 1700s and the second since the mid-1900s. The addition of end occurred in the first half of the 1900s.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
Cite This Source
Example sentences
So order an extra size bigger and make sure you get pants or you'll have a wet
  rear end.
It would throw a lot of people out on their rear end.
It is also a treat of them is that to understand things from the rear end.
Except for a distinguished salt and pepper along his chin and rear end, he
  doesn't look older than seventeen.
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