flashback
/ˈflæʃbek/Definitions
1. noun
a memory or a scene from the past that suddenly comes into one’s mind
“She had a flashback to her childhood and started crying.”
2. verb
to cause someone to have a sudden memory of a past event or scene
“The smell of the perfume triggered a flashback for her.”
3. noun
a scene or sequence of scenes shown in reverse chronological order, often used in films and television shows
“The movie had a long flashback at the beginning to explain the characters’ backgrounds.”