"on the wagon : (idiomatic) Abstaining from drinking any alcoholic drink, usually in the sense of..."

“on the wagon : (idiomatic) Abstaining from drinking any alcoholic drink, usually in the sense of having given it up (as opposed to never having partaken); teetotal.
(by extension) Maintaining a program of self-improvement or abstinence from some other undesirable habit. Bill W. (Bill Wilson), one of the co-founders of Alcoholics Anonymous, was born on this day in 1895.”

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