know whereof one speaks



know whereof one speaks

to know well the subject that one is speaking about. You are wrong! You do not know whereof you speak. He simply doesn't know whereof he speaks.
See also: know, one, speak

Common Names:

NameGenderPronouncedUsage
Kristofor-Croatian (Rare)
Agnetaahng-NE-tah Swedish
Leachlainn-Irish
Athanasi-Medieval Slavic
StefÁNia-Hungarian
Kawehi-Hawaiian