bone of contention

noun
a subject, cause, or focal point of a dispute: The terms of the old man's will were a bone of contention to his survivors.

Origin:
1705–15

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bone of contention
 
n
the grounds or subject of a dispute

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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American Heritage
Idioms & Phrases

bone of contention

Main issue of a disagreement; something to quarrel about. For example, Grandfather's will was a bone of contention for the whole family. This expression alludes to two dogs fighting (contending) over a single bone. In slightly different guise, bone of dissension, it was used figuratively in the 16th century and took its present form in the early 1700s.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
The cause of the four-limbed locomotion, however, is a bone of contention among
  the researchers.
Now it appears that the real bone of contention is the aim of proposed cuts in
  tariffs on manufactured goods.
One bone of contention is social networks' reluctance to draw attention to
  their privacy statements.
One potential bone of contention is with medical monitoring.
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