Ground rule

/ɡɹˈaʊnd ɹˈuːl/

Ground rule

(baseball) a special rule (as in baseball) dealing with situations that arise due to the nature of the playing grounds

a set of basic rules or principles on which future behaviors or actions should be based

Examples

1. And the task force has ground rules.

2. Boundaries are ground rules for acceptable behavior.

3. Explicit ground rules that people follow.

4. The third step is setting some ground rules.