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rule noun ( INSTRUCTION )

Click to hear the UK pronunciation of this wordClick to hear the US pronunciation of this word/ruːl/ n

Definition

[C usually plural] an accepted principle or instruction that states the way things are or should be done, and tells you what you are allowed or are not allowed to do
A referee must know all the rules of the game.
The first/most important rule in life is always to appear confident.
Before you start your own business you should be familiar with the government's rules and regulations.
You must follow/obey/observe the rules.
You must not break the rules.
In special cases the manager will bend/stretch the rules (= allow the rules to be broken).
You can trust Ruth because she always plays (it) by/goes by/does things by the rules (= follows instructions, standards, or rules).
[+ to infinitive] It's against the rules (of/in boxing) to hit below the belt.
[+ that] It's a club rule that new members must sing a song.

(Definition of rule noun (INSTRUCTION) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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