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
Rafael	rah-fah-EL (Spanish), RAH-fah-el (German)	Spanish, Portuguese, German, Hungarian, Slovene, Macedonian
Katsuo	kah-tsoo-o	Japanese
Mcclure	[mə'kluə]
Cyneburga	-	Anglo-Saxon (Latinized)
Ballintine	['bælintain]
Nemo	NEE-mo (English)	Literature