know onions

know your onions

(British & Australian humorous)

to know a lot about a particular subject That car salesman certainly knew his onions, didn't he?

Name	Pronounced	Usage
Tam (1)	-	Scottish
Piers	PEERZ (English), PEERS (English)	English (British), Medieval French
Jimmie	['dʒimi]
Sydne	SID-nee	English (Rare)
Nikolajs	-	Latvian
Mihangel	-	Welsh