a grin like a Cheshire cat

a very wide smile

Usage notes: The Cheshire cat is a character in Lewis Carroll's book Alice in Wonderland and is famous for its big smile.

I just presumed he'd got the job because he walked in here with a grin like a Cheshire cat.

Name	Pronounced	Usage
Alcide	-	Italian
Fiammetta	fyahm-MET-tah	Italian
Zuberi	-	Eastern African, Swahili
Kyriaki	-	Greek
Gerfried	GER-freet	German
Shelah	-	Biblical