an empty hole invites the wind—weakness lends wings to rumours ❍ 臣闻于师，枳句来巢，～。(宋玉《风赋》)I’m told by my Master that a bended orange tree provides a good place for the birds to nest and an empty hole invites the wind.
空穴来风kong xue lai feng
an empty hole invites wind—weakness lends wings to rumours
空穴来风kōnɡ xué lái fēnɡ
穴：洞穴；来：招致。比喻自身存有某些弱点或不足，流言得以乘隙而入。weakness lends wings to rumours, an empty hole invites the wind