To become coated with a thin layer of ice. If the ground frosts over tonight, we'll have a much harder time digging into it tomorrow.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
mod. angry; annoyed. The clerk was really frosted over when I asked for a better one.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.