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
KristĪNa	-	Latvian
Emeline
Bethel	BETH-əl (English)	Biblical
Hugo	OO-go (Spanish), HYOO-go (English), HUY-kho (Dutch), HOO-go (German)	Spanish, Portuguese, Catalan, English, Dutch, German, Swedish, Norwegian, Danish, Ancient Germanic (
Netta (1)	NET-ə	English
Beasley	['bi:zli]