(sound) grasp ofsomething

*a (solid) grasp of something & *a (sound) grasp ofsomething & *a (good) grasp of something

Fig. a firm understanding of something. (*Typically: get \(sound) grasp ofsomething; have\(sound) grasp ofsomething; give someone \(sound) grasp ofsomething.) •

Try to get a grasp of the basic rules.

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You don't have a good grasp of the principles yet.

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John was unable to get a solid grasp of the methods used in his work, and we had to let him go.