since time immemorial

US /sɪns taɪm ɪmɪˈmɔːriəl/
UK /sɪns taɪm ɪmɪˈmɔːriəl/
"since time immemorial" picture
1.

с незапамятных времен, испокон веков

for a very long time, for a period longer than anyone can remember

:
The tradition has been passed down since time immemorial.
Традиция передается с незапамятных времен.
People have been fishing in this river since time immemorial.
Люди ловят рыбу в этой реке с незапамятных времен.