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

1.
sinds mensenheugenis, sinds onheuglijke tijden
for a very long time, for a period longer than anyone can remember
:
•
The tradition has been passed down since time immemorial.
De traditie is overgeleverd sinds mensenheugenis.
•
People have been fishing in this river since time immemorial.
Mensen vissen al sinds mensenheugenis in deze rivier.