1944, from specialized use in psychology of German Angst "neurotic fear, anxiety, guilt, remorse," from Old High German angust, from Proto-Germanic *angusti-, from PIE *anghosti-, suffixed form of root *angh- "tight, painfully constricted, painful." George Eliot used it (in German) in 1849, and it was popularized in English early 20c. by translation of Freud's work, but as a foreign word until 1940s. Old English had a cognate word, angsumnes "anxiety," but it died out.
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