penny-wise and/but pound-foolish
idiom
                                
              
          
                                                      : careful about small amounts of money but not about large amounts                                      
                
                  —used especially to describe something that is done to save a small amount of money now but that will cost a large amount of money in the future
The plans to cut funding are penny-wise and pound-foolish.
    
                
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  Merriam-Webster unabridged




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