A rule of thumb is a principle with broad application that is not intended to be strictly accurate or reliable for every situation. It is an easily learned and easily applied procedure for approximately calculating or recalling some value, or for making some determination.
So, extremely vague, but the boundaries are a little clearer than the last frustrating idiom I blogged about. Question though. Whose thumb would you consider using to establish a rule? I would think an adult's thumb first of all, because children should not make rule's for adults unless you're playing a child's game (which are ALWAYS subject to change in the middle of the game to benefit the child ONLY). And can a thumb act alone in making rules? The thumbs on my hands are practically useless unless a finger or two assist. You could say "they're all thumbs". OMG get me off this merry go round before I get sick!
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