Entertainment / Literature / Juxtaposition: The arrangement of two or more ideas, characters, actions, settings, phrases, or words side-by-side or in similar narrative moments for the purpose of comparison, contrast, rhetorical effect, suspense, or character development. See also antithesis, bathos, foil, mirror passage, and mirror scene.
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Science / Psychiatry / Derailment: A pattern of speech in which a persons ideas slip off one track onto another that is completely unrelated or only obliquely related. In moving from one sentence or clause to another, the person shifts MORE