repressio

Latin reprimere combined re- (back) and premere (to press). Repressio described pressing back: suppressing an uprising, restraining an impulse, damming a flood. The mechanical and hydraulic metaphors were central — repression required active force, and the pressed material did not disappear, it merely built up behind the barrier. A dam could burst.

Josef Breuer and Sigmund Freud's 1895 Studies on Hysteria introduced repression (Verdrängung in German — literally 'displacement,' though translated as repression) as the mechanism by which unacceptable thoughts and memories were pushed from consciousness. The hydraulic metaphor was Freud's explicit choice: like water behind a dam, repressed material pressed against the barrier and found indirect outlets — symptoms, dreams, slips of the tongue.

Freud's 1915 essay 'Repression' made it central to his entire theory. The Oedipus complex, castration anxiety, and infantile sexuality were all understood as the content of repression — the material that culture and development required to be pushed below consciousness. The analyst's task was to allow repressed material to surface safely.

Modern cognitive science has complicated Freud's model. Experimental psychology found limited evidence for the classic repression mechanism. But the clinical phenomenon of trauma-related memory suppression is well-documented under the name 'motivated forgetting.' The Latin hydraulic metaphor — pressure behind a barrier — describes something that genuinely happens, even if Freud's specific theory was wrong.