grin like a Cheshire cat
have a broad fixed smile on your face.
The Cheshire cat with its broad grin is best known for its appearance (and disappearance) in Lewis Carroll's Alice's Adventures in Wonderland (1865). But the expression, which is of uncertain origin, is recorded from the first half of the 19th century.
grin like a Cheshire cat :
grin like a Cheshire cat To HOME PAGE
Idioms Index – Previous Page