1.
back street; back road; alley
A lesser-known or secondary road away from the main streets.
裏道を通って帰る。
To go home via the back streets.
渋滞を避けるために裏道を使った。
I used a back road to avoid the traffic jam.
この裏道には小さなカフェや雑貨屋がたくさんあって、散歩するのが楽しい。
This back street has many small cafés and general stores, making it fun to stroll through.
2.
shortcut; underhanded method
A quicker alternative route, or figuratively, an improper way of doing something.
渋滞を避けるために裏道を使った。
I used a back road to avoid the traffic jam.
裏道を使えば学校まで五分で着ける。
If you take the shortcut, you can get to school in five minutes.
彼は実力ではなく裏道を使って出世したと噂されている。
It is rumored that he got promoted through underhanded methods rather than real ability.
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.
WORD STRUCTURE:
A compound of 裏 (back, reverse) + 道 (road, path).
CONTRAST:
- 表通り: main street, front road
- 裏道: back street, side road
- 近道: shortcut
- 回り道: detour
The figurative sense of "underhanded method" parallels English "back-door dealings."