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
References in periodicals archive ?
Upon completion of listening to the SpeedBriefing, you will have a solid grasp of the necessary concepts to avoid tax problems and other issues that could arise from having poorly drafted employee benefits plans.