have a (good/solid/sound/etc.) grasp of/on (someth

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have a (good/solid/sound/etc.) grasp of/on (something)

To have a firm, clear understanding or determination of something. I hope everyone has a solid grasp of the material, as you'll be tested on it next week. I thought I had a pretty good grasp on English idioms, but I don't understand this one at all!

See also: grasp, have, of, on, solid, sound

Common Names:

Name	Pronounced	Usage
Essie	ES-ee	English
CustÓDio	-	Portuguese
Ottilia	oot-TEE-lee-ah	Swedish
Claudia	KLAW-dee-ə (English), KLOW-dee-ah (German, Dutch), KLOW-dyah (Italian, Spanish, Romanian)	English, German, Dutch, Italian, Spanish, Romanian, Biblical, Ancient Roman
Constant	kawn-STAWN (French), KAHN-stənt (English)	French, English (Rare)
Asco	-	Ancient Germanic