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frost boil[′frȯst ‚bȯil]
An accumulation of water and mud released from ground ice by accelerated spring thawing.
A low mound formed by local differential frost heaving at a location most favorable for the formation of segregated ice and accompanied by the absence of an insulating cover of vegetation.
1. A defective spot on a concrete surface resulting from swelling and subsequent disintegration caused by the action of frost on entrapped moisture.
2. The softening of soil during a period of thaw, owing to the liberation of water.