noun
1.
(in N America) February 2, when it is said that the groundhog comes out of its hole at the end of winter. If the sun shines and the groundhog sees its shadow, it is said that there will be another six weeks of winter.
2.
an event that is repeated without changing :
The Government lost the vote then and it can expect a Groundhog Day next time.
ORIGIN: From the film / movie Groundhog Day about a man who lives the same day many times.
For more information see the Cultural Guide