/ ˌmɑːdi ˈgrɑː; NAmE ˈmɑːrdi grɑː/ noun
[ U ] (from French ) the day before the beginning of Lent, celebrated as a holiday in some countries, with music and dancing in the streets
—compare Shrove Tuesday
For more information see the Cultural Guide
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WORD ORIGIN
French , literally fat Tuesday , alluding to the last day of feasting before the fast of Lent.