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English definition of “rule”

rule

noun [C usually plural] (INSTRUCTION)    /ruːl/
B1 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.Rules and laws
(Definition of rule noun (INSTRUCTION) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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