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
Katja	KAHT-yah (German, Dutch)	German, Swedish, Norwegian, Danish, Dutch, Slovene
Asaph	AY-saf (English)	Biblical
Penelope	pə-NEL-ə-pee (English)	Greek Mythology, English
Torger	-	Norwegian
Emira	-	Bosnian
Neas	-	Irish Mythology