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guide‧line
[countable usually plural]
[countable usually plural]1 rules or instructions about the best way to do something
draw up/issue guidelines 
The hospital has issued new guidelines on the treatment of mentally ill patients.
The hospital has issued new guidelines on the treatment of mentally ill patients. clear/strict guidelines Today most planning authorities enforce fairly strict guidelines on new houses.
Today most planning authorities enforce fairly strict guidelines on new houses.2 something that helps you form an opinion or make a decision :
