Ice over Definition 1 of 3Pro Tip 1/3Natural Occurrences Used when discussing natural water bodies freezing due to cold weather, often in winter. The lake iced over early this year, signaling a long winter. Pro Tip 2/3Not Instantaneous The process of icing over takes time and does not happen immediately. As temperatures dropped, we watched the stream slowly ice over. Pro Tip 3/3Seasonal Reference Often used to indicate seasonal changes, especially the onset of winter. Each year, the villagers wait for the pond to ice over to begin celebrations.