|a scrap or morsel of food left at a meal.|
|a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.|
A king in classical mythology who offended Zeus and was punished in Hades by being forced to roll an enormous boulder to the top of a steep hill. Every time the boulder neared the top, it would roll back down, and Sisyphus would have to start over.
Note: A difficult and futile endeavor may be called a “labor of Sisyphus” or a “Sisyphean task.”