subrule

/ˈsʌbruːl/
noun
  1. A rule that is part of a larger rule or set of rules, often more specific or detailed.
    • The main rule says no running in the hallways, and a subrule adds that you must walk on the right side.
    • Each subrule in the employee handbook explains a different aspect of the dress code.
    • The competition guidelines include a subrule about how many team members are allowed.
Synonyms
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