横道|よこみちyokomichi[0]heiban (flat)

1. nounbyway; side street; cross street
2. nounwrong way; digression

• Related余談よだんNeutralIdle talk outside the main subject; used only for speech and writing, often as 「余談ですが」. Unlike 「横道」, it never means an actual side street.
• Related逸脱いつだつWrittenDeviation from norms, rules, or the intended framework; mostly about behavior and rules. More formal than 「横道」, which is about straying in speech.
• Related脱線だっせんNeutralLiterally a train derailment; colloquially, speech going off topic or behavior overstepping. More casual in tone than 「横道」.
• Related枝道えだみちNeutralA road branching off the main one, also figuratively a digression. Very close to 「横道」, but stresses splitting away from the trunk route.
• Related脇道わきみちNeutralA small road branching off beside the main one, also figuratively straying from the point. Almost interchangeable with 「横道」.
• Antonym本道ほんどうNeutralThe main road, also figuratively the correct, original way of doing things. The opposite of 「横道」, which strays from the proper path.
• Antonym正道せいどうWrittenThe path of righteousness or correct principles; stands opposite 「横道」 straying onto the wrong road. Mostly seen in written/formal prose.
• Antonym本筋ほんすじNeutralThe main thread of a matter or story; the opposite of 「横道」 digressing, as in 「本筋に戻る」.

For talk that strays off topic, say 「話が横道にそれる」 or 「脱線する」; for idle remarks outside the subject, use 「余談」; for deviation from rules, 「逸脱」. The opposite is 「本筋」, the main thread of the matter.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 大通おおどおりではなく、脇わきの小ちいさな通とおり。
2. 本来ほんらいの目的もくてきから外はずれて、別べつの事柄ことがらに進すすむこと。