Come to eat whatever happens to be served; also, take one's chances. For example, You're welcome to join us for supper but you'll have to take potluck, or When the flight was canceled, passengers had to take potluck on other airlines. This idiom alludes to accepting whatever happens to be in the cooking pot. [Second half of 1700s]
Dictionary.com presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.