flashback

noun
flash*back \ ˈflash-ˌbak \
1903{ds||1||}
  • a recession of flame to an unwanted position (as into a blowpipe)
  • interruption of chronological sequence (as in a film or literary work) by interjection of events of earlier occurrence; also : an instance of flashback
  • a past incident recurring vividly in the mind

flash back

verb
flash back \
1944{ds||1||}
  • to focus one's mind on or vividly remember a past time or incident —usually used with to
  • to employ a flashback (as in a film) —usually used with to
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