Slip, as on ice' is a phrase used to describe the action of losing one's footing on a slippery surface, such as ice. This can be dangerous and lead to falls or other injuries. The term 'SKID' is a four-letter word that is often used to describe this action. It is derived from the Old Norse word 'skitha, ' which means 'to slide.' Skidding is a common occurrence in winter months when roads and sidewalks are covered in ice and snow.