off the wagon

Prepositional phrase

idiomatic

(idiomatic) No longer maintaining a program of self-improvement or abstinence from an undesirable habit, especially drinking alcohol.

Japanese Meaning

（特に禁酒や自己改善を試みていたが）再び悪習、特に飲酒に戻ってしまった状態 / 禁酒や節制など、自己改善の取り組みから転じて、以前の悪い習慣に陥ること

After six months sober, Mark admitted he had gone off the wagon and was struggling again.

6か月の断酒の後、マークは禁酒を破って再び苦しんでいると認めた。

Sense（1）

(idiomatic) No longer maintaining a program of self-improvement or abstinence from an undesirable habit, especially drinking alcohol.

She kept up her diet for an entire month before falling off the wagon.