round on (或upon)

• • 突然向(某人)发怒；突然责骂：

    She rounded upon him in the office,charging him with telling lies about her.

    她在办公室里对他大发雷霆，指责他造她的谣。

  • 转身攻击；突然转身与…搏斗：

    The wounded wolf rounded on the hunting dogs and fought to the death.

    受伤的狼转身扑向猎犬作拼死搏斗。