"he has a good grasp of accounting practices"
"within the compass of education"
"a good grip on French history" "they kept a firm grip on the two top priorities" "he was in the grip of a powerful emotion" "a terrible power had her in its grasp"
"he released his clasp on my arm" "he has a strong grip for an old man" "she kept a firm hold on the railing"
"Do you comprehend the meaning of this letter?"