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
Rodolf	RO-dawlf (German)	German (Rare), Dutch (Rare)
Knute	-	Norwegian
İSkender	-	Turkish
Arezu	-	Persian
Mordecai	MAWR-də-kie (English)	Biblical, Hebrew
Ambra	-	Italian