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

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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
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

have a grasp of

see under get a fix on.
See also: grasp, have, of
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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