Cheshire cat

plural Cheshire cats

1. A fictional cat with a broad fixed grin, made popular by Lewis Carroll's Alice's Adventures in Wonderland (1865).

   CHESHIRE CAT. He grins like a Cheshire cat; said of any one who shows his teeth and gums in laughing.

   1788, Francis Grose, A classical dictionary of the vulgar tongue, 2nd corrected and enlarged edition, London

   2 more examples

   “Please would you tell me,” said Alice, a little timidly, for she was not quite sure whether it was good manners for her to speak first, “why your cat grins like that?” “It’s a Cheshire-Cat,” said the Duchess, “and that’s why.”

   1865, Lewis Carroll, Alice's Adventures in Wonderland

   ‘It’s almost as if we’ve gone silly with happiness,’ said Marcus two days later. ‘Everyone in the house going round grinning like a lot of Cheshire Cats! The family I mean.’ ‘And Jess,’ said Kitto quickly. ‘Oh well, Jess is as good as family,’ said Fanny comfortably. Jessamy said nothing, but she looked up quickly and her smile would have rivalled any Cheshire Cat.

   1967, Barbara Sleigh, Jessamy, Sevenoaks, Kent: Bloomsbury, published 1993, →ISBN, page 127

2. attributivecomputingA technique that involves hiding a class's data behind a pointer, so that the code remains binary-compatible even after future changes to members and functionality.

   the Cheshire cat idiom

   1 more example

   the Cheshire cat technique