ground rule Idiom, Proverb
ground rule|ground|rule
n. 1. A rule in sports that is made especially for the grounds or place where a game is played.

Usually used in the plural.
There was such a big crowd at the baseball game, that the ground rules of the field were changed in case a ball went into the crowd. 2. A rule, usually not written, of what to do or how to act in case certain things happen.

Usually used in the plural.
When you go to a new school, you don't know tire ground rules of how you are supposed to behave.
ground rules
ground rules Basic procedures of conduct, as in
The press secretary sets the ground rules for all of the President's press conferences. The term comes from baseball, where it refers to specific rules for a particular ballpark, which are based on special conditions such as a very high outfield fence or a field obstruction of some kind. It began to be transferred to more general use in the mid-1900s.
ground rule
A basal guideline or administering assumption of procedural conduct in a accustomed bearings or endeavor. Often acclimated in the plural ("ground rules"). The byword is a advertence to baseball, in which altered ballparks accept specific arena rules that administer comedy for that accurate field. Before we activate the debate, let's authorize some arena rules about what may and may not be discussed OK, class, actuality are the arena rules: no talking during chic and no corpuscle phones. Follow those and you'll break on my acceptable side.Learn more: ground, ruleground rules
Basic guidelines or administering attempt of procedural conduct in a accustomed bearings or endeavor. A advertence to baseball, area the arena rules administer the aphorism of comedy specific to altered ballparks. Before we activate the debate, let's authorize some arena rules about what may and may not be discussed.Learn more: ground, rule