be/go on the wagon

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be on the wagon

To maintain one's sobriety; to abstain from alcohol. Jim's on the wagon again, so he doesn't want to go to the bar with us tonight.
See also: on, wagon

be/go on the ˈwagon

(informal) no longer drink/decide to stop drinking alcohol, either for a short period of time or permanently, especially if you drink a lot: ‘Would you like a gin and tonic?’ ‘No thanks. I’m on the wagon.’This idiom refers to the water wagon, which in America sprayed roads with water to prevent clouds of dust. If somebody starts drinking alcohol again, they are said to fall off the wagon.
See also: go, on, wagon