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
Gottfrid	-	Swedish
Hrothgar	-	Anglo-Saxon (Latinized)
Alvina	[æl'vainə]
RadÚZ	RAH-doo:s	Czech
Natalia	nah-TAH-lyah (Polish, Italian, Spanish)	Polish, Italian, Spanish, Romanian, Georgian, Late Roman
Arslan	-	Turkish, Turkmen