The term "hard and fast" describes a rule, fact, or policy that is definite, fixed, and unchangeable, meaning it's strictly enforced and not open to exceptions, like "hard and fast deadlines," though often used to say there aren't any such strict rules for something fluid, like "no hard and fast rules for thrifting". It originates from ships running aground (hard and fast aground) and becoming immobile. 
 
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