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rule of thumb

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a rule of thumb

a way of calculating something which is not exact but which will help you to be correct enough. A good rule of thumb is to cook two handfuls of rice per person.

See also: rule, thumb

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? References in classic literature
She was born in a rural district of England, where life proceeds by rule of thumb and the unexpected is so very unexpected that when it happens it is looked upon as an immorality. Love of Life And Other Stories by London, Jack View in context More results

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