The Cheshire cat grin is “a smile with far too many teeth on display, where the mouth doesn’t match up with the eyes, going practically from ear to ear,” according to TV Tropes.

Precious Tabby Shelter Cat's Charming 'Cheshire Grin' Has People Absolutely Smitten. Eve Vawter. Sat, April 5, 2025 at 8:45 PM UTC. 2 min read.

In the book, the Cheshire Cat appears to Alice in a variety of guises — as a huge head (without a body), and a big grin. “I have often seen a cat without a grin,” says Alice.