guideline noun

/ˈgaɪd.laɪn/ n [C usually plural]

Definition

information intended to advise people on how something should be done or what something should be

The EU has issued guidelines on appropriate levels of pay for part-time manual workers.

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

Synonyms and related words:

If a problem preys on your mind, you think about it and worry about it a lot

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