noun
side street; byway; cross street
A smaller street branching off from a main road; often implies a narrow or less-traveled path.
大通りから横道に入ると、急に静かになった。
When we turned off the main street into a side street, it suddenly became quiet.
noun
digression; straying from the point
Figurative use for going off-topic in conversation or thought; often used in phrases like 横道にそれる.
話が横道にそれてしまった。
The conversation digressed.