Note it has two meanings: Flashback to the aviators I couldn't recover in Vietnam is different from Jane Austen's use of flashback in Pride and Prejudice.
A flashback refers to a sudden and vivid memory or recollection of a past event. It is as if you are momentarily transported back in time and reliving that specific moment. Flashbacks can be triggered by various stimuli such as a sound, smell, or visual cue. They often occur in response to something in the present that reminds the person of a past experience.