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round on

British  

verb

  1. (intr, preposition) to attack or reply to (someone) with sudden irritation or anger

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

round on Idioms  
  1. Turn on, assail, especially verbally. For example, They all rounded on Jake for not upholding the party line. [Mid-1800s]