Definition of frost line in English:

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frost line

noun

[in singular] North American
The maximum depth of ground below which the soil does not freeze in winter.
Example sentences
  • You could completely solve this problem by preparing a foundation for your pad that would extend down into the soil below the frost line, but this isn't practical for a pad of any size.
  • Install small-diameter pipes below the frost line to prevent freezing.
  • In the fall, they move down in the soil, usually below the frost line, to spend the winter.
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