The term 'make slow progress' can be expressed in four different ways, each with four letters. The first is 'INCH, ' which means to move forward very slowly and gradually. The second is 'SLOG, ' which means to work hard and slowly. The third is 'PLOD, ' which means to walk heavily and laboriously. The fourth is 'WADE, ' which means to move through water or something else that is difficult to traverse. All of these words describe the same concept of making slow progress.