1.
back street; back road; alley
A lesser-known or secondary road away from the main streets.
2.
shortcut; underhanded method
A quicker alternative route, or figuratively, an improper way of doing something.
裏道 refers to a secondary or less-traveled road behind or away from main streets, and by extension, a shortcut or an underhanded way of doing things. The literal sense describes quiet side streets, while the figurative sense implies bypassing proper channels.
Etymology
A compound of 裏 (back, reverse) + 道 (road, path).
Similar words
The figurative sense of "underhanded method" parallels English "back-door dealings."
Related Words
Compare:
表通り (main street, front road)
Compare:
近道 (shortcut)
Compare:
回り道 (detour)
Related:
抜け道 (shortcut)
Compare:
細道 (narrow path)