to go upstream; to go back (in time, to origin); to date back to; to trace back to
going upstream; sailing against the current
going upstream; swimming upstream
going upstream; sailing against the current
tracing back; retroactivity
returning to the origin; going back to the beginning; retracing
anadromous fish (fish that migrates upstream, e.g. salmon)
retrospective bibliography
right of recourse; right for redemption