flashback

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1. a. A literary or cinematic device in which an earlier event is inserted into the normal chronological order of a narrative.
   b. The episode or scene depicted by means of this device.
2. An unexpected recurrence of the effects of a hallucinogenic drug long after its original use.
3. Psychology A recurring, intensely vivid mental image of a past traumatic experience: “Another study shows that women who served in Vietnam still struggle with depression, anxiety, and painful flashbacks from the war” (New York Times).