what is the meaning of "as a matter of fact

as a matter of fact = in reality; actually; in fact:
As a matter of fact, there is no substance to that rumor.

有人答"as a matter of fact" = "in fact". 嚴謹一點來說, "as a matter of fact" 同 "in fact" 用法有些少不同.

"as a matter of fact": (spoken) used when you're answering someone and telling them what you really think or what the real situation is.

"in fact": used to say what is the real truth of a situation is, esp. when this is different from what people think or say it is.

"as a matter of fact" 即係實際上嘅意思。