The exception that proves the rule
Definition 1 of 2
Pro Tip 1/3Figurative Sense
Understand it's not literal; it points to unusual cases highlighting a rule's general truth. 
In a sea of tech enthusiasts, her indifference to smartphones is the exception that proves the rule.
Pro Tip 2/3Not Justifying Errors
It's not used to excuse mistakes but to emphasize the reliability of a general pattern. 
He rarely makes spelling errors, his one mistake was the exception that proves the rule.
Pro Tip 3/3Irony and Surprise
It can express irony or surprise when an unlikely event occurs amidst the usual pattern. 
A sunny day in the rainy season could be said to be the exception that proves the rule. 
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