off the wagon

off the wagon  {adj. phr.},  {slang}
No longer refusing to drink whiskey or other alcoholic beverages; drinking liquor again, after stopping for a while.
When a heavy drinker quits he must really quit. One little drink of whiskey is enough to drive him off the wagon.
Contrast: ON THE WAGON.
Categories: adjective slang
Source: A Dictionary of American Idioms

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