the 2nd February, celebrated in the US. On this day, according to old stories, the groundhog comes out of its hole for the first time since winter began. If it sees its shadow, it is frightened back into its hole and there will be six more weeks of winter, but if it is cloudy and the groundhog cannot see its shadow, there will be an early spring.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
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