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1. To become covered in or coated with ice. We should put down some salt and gravel so the steps don't ice over during the night. The lake doesn't usually start icing over until November or December.
2. To cause something to become covered in or coated with ice. In this usage, a noun or pronoun can be used between "ice" and "over." The frigid temperature iced the steps over during the night.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
[for water] to freeze and develop a covering of ice. I can't wait for the river to ice over so we can do some ice fishing.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.