(idiomatic) The rare occurrence of a counterexample to a rule, used to underscore that the rule exists
See also Exception_that_proves_the_rule#Loose_rhetorical_sense
Elda Taluta; Sarks Sark; Ark Arks
In reply to Re^3: Improved instructions
by Argel
in thread Improved instructions
by John M. Dlugosz
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