沸沸扬扬（沸沸揚揚）　

◎ 沸沸扬扬 fèifèi-yángyáng

[bubbling with noise;heated with everyone speaking] 沸水蒸腾翻滚,形容众人议论沸腾传播

此事不到半天,外面就沸沸扬扬传开了