know what are talking about

know what you are talking about

to speak in an informed way because of your experience or education He doesn't know what he's talking about. He's never even been to Alaska.

Name	Pronounced	Usage
Torcuil	-	Scottish
Jehoash	ji-HO-ash (English), jee-HO-ash (English)	Biblical
Kandake	-	Biblical, Biblical Greek
Myeong-Suk	myung-sook	Korean
Dot	DAHT	English
Zaccheus	-	Biblical Latin