jump back in time
jump back in time
To move to an earlier point in time, especially suddenly or abruptly, as in a narrative. The novel starts out in the year 2000 but then jumps back in time to the 1960s. I think you'll confuse the reader if you keep jumping back in time like that.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.