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We need new club rules before we start looking for more members.
the basic rules of the game
Anyone who breaks the rules will face disciplinary action.
You should always follow these simple rules when using electrical equipment.
You can't do that, it's against the rules!
They complain that businesses are being hampered by too many rules and regulations.
This is the British English definition of rule. View American English definition of rule.
a substance that scientists think exists out in space, but for which they have no direct proof