流言蜚语，原指没依据的话，目前多指在其他人背后散布的诬蔑、中伤的说法。可以翻译为unfounded rumors1 and malicious2 gossip，rumors and slanders等。散布流言蜚语翻译为spread rumors。
例句：
流言蜚语满天飞。
There are a lot of unproven allegations flying around.
关于他的离职，在商界一直有不少流言蜚语。
There has been much gossip in commercial circles as to his resignation.