1. a thin layer of ice crystals that forms on surfaces when the temperature drops below freezing
2. weather conditions cold enough to cause freezing

1. to cover with frost or become covered with frost
2. to cover a cake with frosting

Examples

• The car windshield was covered with frost this morning.
• There will be frost tonight, so bring in the plants.
• The windows frosted over during the cold night.
• She frosted the birthday cake with chocolate icing.
• Heavy frost damaged the crops.
• The grass was white with frost at dawn.
• Cold air caused the glass to frost up.