as a matter of fact
US /æz ə ˈmæt.ər əv fækt/
UK /æz ə ˈmæt.ər əv fækt/

1.
in feite, inderdaad
in reality; in fact (used to emphasize the truth of a statement, often one that is contrary to what might be expected)
:
•
I thought he was angry, but as a matter of fact, he was quite pleased.
Ik dacht dat hij boos was, maar in feite was hij best tevreden.
•
Are you going to the party? As a matter of fact, I am.
Ga je naar het feest? Jazeker, dat doe ik.