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Unthaw (verb)
To thaw out, to unfreeze; to become soft (of something which had been frozen).
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Thaw (verb)
To gradually melt, dissolve, or become fluid; to soften from frozen
“the ice thaws”
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Thaw (verb)
To become so warm as to melt ice and snow — said in reference to the weather, and used impersonally.
“It’s beginning to thaw.”
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Thaw (verb)
To grow gentle or genial.
“Her anger has thawed.”
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Thaw (verb)
To gradually cause frozen things (such as earth, snow, ice) to melt, soften, or dissolve.
Wiktionary
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Unthaw (verb)
melt or thaw
“the warm weather helped unthaw the rail lines”
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Unthaw (verb)
still frozen
“you can cook prawns from frozen by plunging them, unthawed, into boiling water”
Oxford Dictionary