ice up is a verb meaning "become covered with a layer of ice; of a surface such as a window". It carries one recorded sense.
become covered with a layer of ice; of a surface such as a window
“When the wings iced up, the pilot was forced to land his plane”
Definitions, synonyms and semantic relations for ice up come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.