Below are possible answers for the crossword clue O. Henry device.
5 letter answer(s) to o. henry device
IRONY
a trope that involves incongruity between what is expected and what occurs
incongruity between what might be expected and what actually occurs; "the irony of Ireland's copying the nation she most hated"
witty language used to convey insults or scorn; "he used sarcasm to upset his opponent"; "irony is wasted on the stupid"; "Satire is a sort of glass, wherein beholders do generally discover everybody's face but their own"--Jonathan Swift
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