Idiom Definition:
  
    
    
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"to fall of the wagon"
    to begin drinking alcohol after a period of abstinence
     
    
Synonyms:
abstain, abstinence, alcohol, addiction, backslide, booze,  bottle, compulsion, control, decline, degenerate, deteriorate, drink, lapse, regress, relapse, resume, retrograde, retrogress, stop, stopped, uncontrolled
 
 
This elephant is literally 
falling off the wagon. - - - - ->