unthaw (v.)youdaoicibaDictYouDict[unthaw 词源字典]
1590s, "to thaw," from un- (2) "opposite of" + thaw (v.). Related: Unthawed; unthawing. Unthawed also sometimes is used with a sense "frozen" (1610s.).[unthaw etymology, unthaw origin, 英语词源]