know what are doing

know what you are doing

to have the necessary knowledge or experience to do something Mountain climbing is a dangerous sport, so I hope he knows what he's doing.

Name	Pronounced	Usage
EsmÉE	es-MAY (Dutch)	English, Dutch
Mu	-	Chinese
Batya	-	Hebrew
Kari (1)	-	Norwegian
Thor	THOR (English), TOR (Danish), TOOR (Swedish, Norwegian)	Norse Mythology, Danish, Swedish, Norwegian
Tybalt	-	Literature