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Greek: chiasmos (cross-wise arrangement)
Reversing structure of phrases for rhetorical effect (AB-BA pattern)
Chiasmus is a rhetorical figure in which the grammatical or conceptual structure of one clause is reversed in a subsequent clause, producing an AB-BA pattern. The name derives from the Greek letter chi (χ), whose crossing shape mirrors the device's essential movement: an idea travels in one direction and then doubles back on itself. In classical rhetoric it was catalogued among the figures of repetition and balance, closely related to antimetabole, though purists distinguish chiasmus (structural reversal without exact word repetition) from antimetabole (reversal with the same words recurring). Cicero and Quintilian both noted its power to create a sense of intellectual completeness, as though the second half of a statement answers and seals the first.
The crossing structure satisfies the mind's appetite for symmetry and closure: the listener feels a kind of cognitive click when the reversed pattern resolves, which lends the statement an air of inevitability and wit. Because the second clause appears to emerge logically from the first, chiasmus can make what is in fact a rhetorical choice feel like a discovered truth. The form also aids memory, since the mirroring gives the listener two anchor points rather than one.
John F. Kennedy's 1961 inaugural address contains the celebrated instance: "Ask not what your country can do for you — ask what you can do for your country." The reversal transforms a piece of civic instruction into something that feels almost like a natural law, and the line has remained quotable for over six decades.
Samuel Johnson, reflecting on the relationship between writing and knowledge, is reported to have observed that a man will turn over half a library to make one book, suggesting the same inversion: much reading makes little writing, and yet much writing demands much reading — a chiastic relationship he explored in both directions across his career.
In everyday commercial rhetoric, the slogan structure 'live to eat, not eat to live' deploys chiasmus to distinguish an attitude toward food from a merely functional one, using the reversal to imply that the speaker's brand represents pleasure rather than mere sustenance.
Identify two concepts or actions that can be placed in genuine tension or complementary relationship, then construct a first clause that names them in sequence and a second clause that inverts that sequence. The reversal should feel earned rather than forced: the two halves must illuminate each other, not merely mirror one another for show. Chiasmus is most effective at moments of summary or climax, where a speaker wishes to crystallise an argument into a single memorable formulation. Speak or write it with slight deliberation, allowing the listener to hear the turn.
Listen for a statement in which the key words or grammatical roles of the first half reappear in the second half in reversed order, creating a crossing or mirroring effect. When you notice this pattern, pause to ask whether the reversal genuinely reveals a relationship between the two ideas, or whether it is merely a formal trick that flatters a shallow claim with the appearance of depth. A well-formed chiasmus will stand up to paraphrase; a hollow one tends to dissolve the moment you restate it in plain prose.
Because the form is inherently satisfying to the ear, chiasmus can bestow a spurious sense of logical completeness on claims that have not actually been argued. A speaker who says, in effect, that strength comes from weakness and weakness from strength has produced a pleasing reversal but may have said very little that is verifiable or true. Ethical use of chiasmus requires that the reversal genuinely capture a real relationship between ideas, not merely exploit the listener's pleasure in symmetry to bypass their critical judgement.
Memorable quotes, speeches, conclusions