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All fours specifically refers to two cases or decisions that have similar fact patterns and raise identical legal issues. Since the circumstances leading to their individual determinations are virtually the same, the decision rendered by the court in each case will be similar. Such cases or decisions are said to be on all fours with each other.
ALL FOURS. This is a metaphorical expression, to signify that a case agrees in all its circumstances with another case; it goes as it were upon its four legs, as an animal does.