Mardi Gras is the Christian festival of Shrove Tuesday, the day before Lent, which people in some places celebrate by wearing colourful costumes and dancing through the streets.
Mardi Gras in British English
(ˈmɑːdɪ ˈɡrɑː)
noun
the festival of Shrove Tuesday, celebrated in some cities with great revelry
Word origin
French: fat Tuesday
Mardi Gras in American English
(ˈmɑrdiˌgrɑ)
US
1.
Shrove Tuesday, the last day before Lent: it is a day of merrymaking and carnival, as in New Orleans, often marking the climax of a carnival period