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To not thaw; to (re-)freeze or remain frozen.
To thaw out, to unfreeze; to become soft (of something which had been frozen).
The senses, opposites in meaning, are from un- (“reverse, undo”) + thaw (“melt”) and un- (“release, extract”) + thaw (“melt”), respectively. The sense "not thaw, remain frozen" is from the late 1500s.
From Wiktionary
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