Idiom Definition:
  
  
  
  
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"to bet your bottom dollar"  
    to be absolutely sure about something or someone
     
Synonyms:
assured, believing, certain, confident, convinced, positive, questionless, self-confident, sure, undoubtful, undoubting
 
 
The cowboy is going to literally
 bet his bottom (last)
 dollar. - - - - ->  
