be grinning like a Cheshire cat

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be grinning like a Cheshire cat

To be smiling smugly or mischievously. The term was popularized by the character in Lewis Carroll's Alice's Adventures in Wonderland. I knew he had a prank planned for April Fools' Day when he arrived at work and was grinning like a Cheshire cat.
See also: cat, Cheshire, grin, like

be grinning like a Cheshire cat

or

be smiling like a Cheshire cat

If someone is grinning like a Cheshire cat, or is smiling like a Cheshire cat, they are smiling broadly, usually in a foolish way. Standing on the door step and grinning like a Cheshire Cat was Bertie Owen. He came indoors, smiling like a Cheshire cat, expecting to be congratulated. Note: You can also say that someone has a Cheshire cat grin or a Cheshire cat smile. I complained, but Jennifer stood there with her Cheshire cat grin. A beaming Steve stood in the background, nodding his head up and down and wearing a Cheshire Cat smile on his face. Note: The Cheshire cat is a character from `Alice in Wonderland' (1865) by the English writer Lewis Carroll. This cat gradually disappears until only its huge smile remains. The idea for the character may have come from Cheshire cheese, which was made in the shape of a smiling cat. Alternatively, it may have come from hotel signs in Cheshire, UK, many of which had a picture of a smiling lion on them.
See also: cat, Cheshire, grin, like
References in periodicals archive ?
The Take That star has been grinning like a Cheshire cat since the pair announced their engagement in November 2009, after Robbie, 36, proposed on an Australian radio show.
NO wonder Liz Hurley has been grinning like a Cheshire cat since bagging new man Arun Nayar.