back road; byroad; side street
Refers to a less-traveled road, often a back street or a route away from the main thoroughfare. Can be used literally or figuratively for an alternative, less conspicuous path.
I took the back road to the station.
彼は表舞台ではなく、裏街道を歩む人生を選んだ。
He chose a life off the beaten track, not in the limelight.