at odds - Phrases/Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
In disagreement, opposed. For example, It is only natural for the young and old to be at odds over money matters. This idiom uses odds in the sense of “a condition of being unequal or different,” and transfers it to a difference of opinion, or quarrel. [Late 1500s]