butt heads(redirected from butting heads)
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1. Literally, to knock heads together, as of rams or sheep. The two male rams fiercely butted heads to establish dominance among the group.
2. By extension, to completely disagree or get into a heated confrontation with someone. Jonathan and Cynthia always butt heads over politics when they're together. I got kicked out of the bar when I started butting heads with that guy.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.