unthawed; unthawing
: thaw
A fuel station operator apparently caused the 5:30 a.m. blast by using an open flame to unthaw a frozen tank valve …—Associated Press
Escape the winter freeze and unthaw in beautiful tropical settings …—Business Wire
Note: Although unthaw as a synonym of thaw is sometimes cited as an illogical error, it has persisted in occasional use for more than four centuries. It occurs in both American and British English.
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Merriam-Webster unabridged
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