“He tried to grin but it did not go well.”

““I’ll drive. You navigate.” He grinned. “I judge people by how well they read maps.””

“And the Devil did grin, for his darling sin
Is pride that apes humility.”

“He grinned at her, and she grinned at him, and it seemed to Maria that suddenly the sun came out.”

“He grinned, and the grin changed his face completely. Ty when he was still and expressionless had an intensity that fascinated Kit; when he was smiling, he was extraordinary.”

“Missing you?" she giggled incredulously. "I could cheerfully murder you."
"I'd come back to haunt you," he threatened with a grin.
"And that," she said, "is the only reason why I haven't tried.”

“Well! I've often seen a cat without a grin,' thought Alice 'but a grin without a cat! It's the most curious thing i ever saw in my life!”

“He clenched Nix's shoulders. 'Why did you hesitate? I saw you hesitate!' He shook her until her head lolled, while she grinned and said, 'Wheeee!”

“To the pure geometer the radius of curvature is an incidental characteristic — like the grin of the Cheshire cat. To the physicist it is an indispensable characteristic. It would be going too far to say that to the physicist the cat is merely incidental to the grin. Physics is concerned with interrelatedness such as the interrelatedness of cats and grins. In this case the "cat without a grin" and the "grin without a cat" are equally set aside as purely mathematical phantasies.”

“He whirled in the water and grinned at me. Damn, he was a handsome bastard. I realized he was half-naked. Blue swirls of tattoos painted his chest. When God made that chest, he did to tempt women.”