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Related to round on: round games
To suddenly attack, berate, or show hostility toward someone, especially verbally. I know he seems friendly, but he'll round on you in an instant if you disagree with him. I was really taken aback when Sally rounded on me because of what I said. It was just a joke, after all!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
Turn on, assail, especially verbally. For example, They all rounded on Jake for not upholding the party line. [Mid-1800s]
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.
To assail someone suddenly; turn on someone: The entire group rounded on me when I questioned their motives.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.