ice over vs ice up

ice over and ice up both are verbs.

Word	Noun	Adjective	Verb	Adverb
ice over	No	No	Yes	No
ice up	No	No	Yes	No

As verbs, ice over and ice up are synonyms defined as:

ice over and ice up: become covered with a layer of ice; of a surface such as a window

Other synonyms of ice over include frost over.

ice over (verb)	ice up (verb)
become covered with a layer of ice; of a surface such as a window	become covered with a layer of ice; of a surface such as a window