The term 'tautness lose' refers to the opposite of tautness, which is a state of being tight or stretched. The two crossword solutions for this term are 'DROOP' (5 letters) and 'SAG' (3 letters). DROOP is a verb meaning to hang down loosely or bend downward, while SAG is a verb meaning to become less firm or to DROOP. Both words describe a lack of tautness, as something that is drooping or sagging is not tight or stretched.