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
Ikram	-	Arabic
Lior	-	Hebrew
Boswell	['bɔzwəl]
Rivqah	-	Biblical Hebrew
Celsus	-	Ancient Roman
Stig	-	Swedish, Norwegian, Danish