Grasp means to take hold of something firmly with your hand. When you grasp a rope in gym class, you close your fingers around it tightly so you won't slip. You might grasp a railing while climbing stairs, or grasp your friend's hand in a crowded place.

The word also describes understanding something, especially when that understanding comes suddenly or takes effort. When you finally grasp a tricky math concept, it clicks in your mind and makes sense. A student struggling with fractions might work through several problems before finally grasping how they work. Teachers often ask, “Do you grasp what I'm explaining?” to check if students truly understand.

Sometimes we talk about ideas being within your grasp or beyond your grasp. A goal within your grasp is achievable if you keep working at it. Something beyond your grasp is too difficult to understand or accomplish right now. Your grasp of a subject is how well you understand it: someone with a strong grasp of history knows the subject deeply, while someone with a weak grasp understands only the basics.

The physical and mental meanings connect: both involve getting a firm hold on something, whether it's an object in your hand or an idea in your mind.