空穴来风的英文：
[Literal Meaning]
empty/hole/come/wind
An empty hole invites the wind

[解释]
有了洞穴才进风。比喻消息和谣言的传播不是完全没有原因的。

[Explanation]
Weakness lends wings to rumors.

[例子]
这些话都是空穴来风，我有很多的证据。

[Example]
These words are not groundless and baseless at all because I have a lot of evidence.

He's denied having an affair with his secretary,but of course there's no smoke without fire.
他不承认和他秘书发生了关系, 但自是空穴来风喽.