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
Stephanos	-	Ancient Greek, Biblical Greek, Greek
Wickaninnish	wik-ə-NIN-ish (English)	Native American, Nuu-chah-nulth
Iisakki	EE:-sahk-kee	Finnish
Lay	[lei]
Elva (2)	-	Danish, Icelandic
Matthias	mah-TEE-ahs (German), mə-THIE-əs (English)	Greek, German, Swedish, Norwegian, Danish, French, Dutch, Biblical, Biblical Latin, Biblical Greek