Definition

Verb: * To become covered with a layer of ice, typically in a thin, crystalline coating. This process usually occurs when water vapor in the air freezes directly onto a cold surface.

Usage

The verb "frost over" describes the natural process by which a clear surface becomes opaque or white due to the formation of ice crystals. It is intransitive (it does not take a direct object).

Examples

• "On cold winter mornings, the car windows often frost over."
• "If you don't cover the plants, they might frost over tonight."
• "The pond began to frost over as the temperature dropped below freezing."

Advanced Usage

• Causative Sense: While "frost over" itself is intransitive, the related verb "frost" can be used transitively to mean something to become covered with frost (e.g., "The cold night air frosted the grass.").

Variants and Related Words

• Ice up (verb): A close synonym, often used for mechanical parts or larger surfaces becoming blocked or coated with ice (e.g., "The airplane's wings iced up.").
• Freeze over (verb): Typically implies a thicker, solid layer of ice forming on a body of water (e.g., "The lake froze over.").
• Frost (noun): The white, icy coating itself.
• Frosty (adjective): Covered with frost; very cold.

Synonyms

• Ice up
• Become iced

Related Phrasal Verbs

• Freeze over: To become covered with a solid layer of ice. (Often used for larger surfaces like ponds or lakes, whereas "frost over" suggests a thinner, more delicate coating).
  • Example: "The shallow puddles froze over overnight."

Verb

1. 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