grab at something
grab for something

With the other hand he grabbed again for the hair.

She took a step back, grabbed for the wall to support herself.

Do you reach out and try to grab for support?

Standing up, he grabbed for the piece of paper and made his way toward her.

He grabbed her hands for fear she'd turn away again.

She grabbed for my arm, and I had an idea.

This is one that will grab at you for quite some time.

The line went dead, and I grabbed for a bag.

And though the boy didn't speak, he knew enough to grab for it.

He reached out and grabbed for something to hold onto.