Related Clues:
- Require scraping or salting, perhaps
- Freeze on glass
- Freeze over, as airplane wings
- Freeze, as a window pane
- Get slick in winter
- Get slippery in winter
- Become frost-covered
- Become unusable, as airplane wings
- Become frosted
- Acquire a wintry glaze (2 words)
- Frost inconveniently
- Become slick, in a way
- Become frozen, as a windshield
- Freeze over; glaciate
- Of a lake, say, become frozen