Together years ago? (2,3,4)
I believe the answer is:
at one time
I believe this is a double definition.
'together' is the first definition.
(I've seen this before)
'years ago?' is the second definition.
(Other definitions for at one time that I've seen before include "in the past" , "Taking place simultaneously" , "Formerly" , "in concert" , "in former days" .)