round on

British  

verb

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

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round on Idioms  

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

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Example Sentences

Murphy got to his feet quickly and drew roars from the crowd with a counter right hook, but Evloev would end the round on top as a flurry of strikes opened a cut above the Mancunian's left eye.

From BBC

USC will face No. 1 South Carolina in the second round on Monday.

From Los Angeles Times

BTS rally round on the closing track, Into The Sun.

From BBC

Boulter will play Danish world number 16 Clara Tauson in the second round on Thursday.

From BBC

“That will be a challenge for me,” said the characteristically even-keeled Pegula after defeating former French Open champion Jelena Ostapenko in the third round on Monday.

From Los Angeles Times