Definition of grin like a Cheshire cat in English:

grin like a Cheshire cat

Have a broad fixed smile on one’s face.
More example sentences
  • Is he trying not to smile but inside grinning like a Cheshire cat?
  • Connor was grinning like a Cheshire cat when I'd finished.
  • I could sense that she was probably grinning like a Cheshire cat.
See parent entry: Cheshire cat

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