Slip and slide is a popular activity for children and adults alike. It involves sliding down a slippery surface, usually a plastic sheet, with the help of gravity and momentum. The term 'slip and slide' can be broken down into two crossword solutions: SKID (4 letters) and SLITHER (7 letters). SKID is defined as to slide or glide along a surface, while SLITHER is defined as to move smoothly and sinuously like a snake. Together, these two words describe the action of slipping and sliding down a slippery surface.