A Bucks Fizz is an alcoholic drink.
Fill a champagne glass 1/3 full of orange juice. Top with champagne and a dash of grenadine.
The drink is named after London's Buck's Club where it was first served in 1921.
The Buck's Fizz is the English version of the more American Mimosa. Both drinks are usually served at brunch.
Note: Although the recipe given here, with grenadine, may be the original usage, most British people will understand 'Buck's Fizz' to refer to a mixture of orange juice and champagne; i.e. it is the usual British term for what Americans would call a 'Mimosa'.
See also: List of cocktails