ITV romantic sitcom starring Judi Dench and Geoffrey Palmer (2,4,4,2)
I believe the answer is:
as time goes by
If this is the answer, I'm afraid I cannot explain it.
Can you help me to learn more?
(Other definitions for as time goes by that I've seen before include "through the years?" , "Song you must remember" , "Play it, Sam. Play - (Casablanca)" .)