We use this expression in reference, addition to what has been said
You can use this phrase in ………… language.
A: I thought you said you were on my side!
B: I did say that, as a matter of fact, but what you’re suggesting is irrational.
A: Have you heard anything about our neighbours lately? I haven’t seen them for a while.
B: As a matter of fact, I think they’re getting a divorce.