The term 'straighten up' can be broken down into four crossword solutions: NEATEN (6 letters), TIDY (4 letters), ALIGN (5 letters), and SHAPE (5 letters). NEATEN means to make something neat and orderly, while TIDY means to put things in order. ALIGN means to arrange in a straight line, and SHAPE means to give something a particular form. Together, these words suggest the idea of organizing and arranging something in an orderly fashion.