since time immemorial
US /sɪns taɪm ɪmɪˈmɔːriəl/
UK /sɪns taɪm ɪmɪˈmɔːriəl/

1.
sejak zaman berzaman, sejak dahulu kala
for a very long time, for a period longer than anyone can remember
:
•
The tradition has been passed down since time immemorial.
Tradisi itu telah diwarisi sejak zaman berzaman.
•
People have been fishing in this river since time immemorial.
Orang ramai telah memancing di sungai ini sejak zaman berzaman.