know for a fact

To have definitive knowledge of something. I know for a fact that he cheats in cards! I saw the ace up his sleeve. My mom says she knows for a fact that I'm getting the internship at her company, but I won't believe it until the recruiter calls me.

Common Names:

Name	Pronounced	Usage
Helena	he-LE-nah (German, Swedish, Norwegian, Danish, Polish), hay-LAY-nah (Dutch), HE-le-nah (Finnish)	German, Dutch, Swedish, Norwegian, Danish, Icelandic, Portuguese, Polish, Czech, Slovak, Finnish, Es
Herkus	-	Lithuanian
Patigul	-	Uyghur
Rina (4)	ṙee-nah	Japanese
Sopio	-	Georgian
Dre	-	English