Ans. That huper pantos, “for every one,” is here used for huper pantōn, “for all,” by an enallage of the number, is by all acknowledged.    From Wordnik.com.  [The Death of Death in the Death of Christ] Reference

In his 1908 magnum pompous Grammar as a Science, B.F. Sisk defines enallage as.    From Wordnik.com.  [SFist] Reference

Second, perhaps this example is not an error at all, but rather a poetic deviation from standard diction in order to enhance the impact of the claim -- a trick known as enallage.    From Wordnik.com.  [SFist] Reference

I will further spare four out of the seven figures of less note: emphasis, enallage, and the hysteron proteron you must have; because emphasis graces Irish diction, enallage unbinds it from strict grammatical fetters, and hysteron proteron allows it sometimes to put the cart before the horse.    From Wordnik.com.  [Tales and Novels — Volume 04] Reference

The enallage, ‛ οστις.    From Wordnik.com.  [The Tragedies of Euripides, Volume I.] Reference

More on enallage here.    From Wordnik.com.  [SFist] Reference