To understand.
To take advantage of something, to seize, to jump at a chance.
To grip; to take hold, particularly with the hand.
Understanding.
That which is accessible; that which is within one's reach or ability.
Grip.
To understand wrongly, taking one thing or person for another.
An error; a blunder.
A pitch which was intended to be pitched in a hard-to-hit location, but instead ends up in an easy-to-hit place.