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plural ground rules
(sports) A rule regarding play on a specific field, course, or court. examples
(idiomatic, usually in the plural) The basic rules or standards; whatever someone must know before proceeding. quotations examples
The apparent success of the City and South London triggered an avalanche of bills for Tube railways, and in 1892 a Joint Select Committee of Parliament set out some ground rules.
2012, Andrew Martin, Underground Overground: A passenger's history of the Tube, Profile Books, page 109