Learn how to say Flashback correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word flashback:
1a scene in a film, novel, etc. set in a time earlier than the main story:
in a series of flashbacks, we follow the pair through their teenage years
the movie tells the story in flashback
a disturbing sudden vivid memory of an event in the past, typically as the result of psychological trauma or taking LSD.
2a flame moving rapidly back through a combustible vapour:
cooling the area prevented a flashback