Slide on slats is a skiing technique that involves sliding down a sloped surface with the skis parallel to the slats. This technique is used to practice balance and control while skiing, as well as to improve the skier's ability to turn quickly. The term 'slide on slats' is derived from the fact that the skis are sliding along the slats of the slope. The crossword solution for this term is SKI, which is an acronym for the sport of skiing.