adv. phr. Actually; really; in addition to what has been said; in reference to what was said. Often used as an interjection. It's not true that I cannot swim; as a matter of fact, I used to work as a lifeguard in Hawaii. Do you think this costs too much? As a matter of fact, I think it is rather cheap.
AS A MATTER OF FACT
Meaning of AS A MATTER OF FACT in English
American idioms English vocabulary. Английский словарь американских идиом. 2012