D defs.my
Entry 2 senses Webster, 1913

flashback

· IPA /ˈflæʃ.bæk/
01 n. a transition (in literary or theatrical works or films) to an earlier event or scene; also, the scene thus introduced.
  1. 1.
    a transition (in literary or theatrical works or films) to an earlier event or scene; also, the scene thus introduced.
  2. 2.
    An unusually vivid recollection of a prior experience, often one that is traumatic, such as scenes from combat or a criminal assault, or induced by hallucinogenic drugs such as LSD; when accompanied by hallucinations it is called flashback hallucinosis.