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Douglas Harper's Etymology Dictionary
unthaw

1590s, "to thaw," from un- (2) "opposite of" + thaw (v.). Related: Unthawed; unthawing. Unthawed also sometimes is used with a sense "frozen" (1610s.).

Wiktionary
unthaw

vb. 1 To not thaw; to (re-)freeze or remain frozen. 2 To thaw out, to unfreeze; to become soft (of something which had been frozen).

WordNet
unthaw

v. become or cause to become soft or liquid; "The sun melted the ice"; "the ice thawed"; "the ice cream melted"; "The heat melted the wax"; "The giant iceberg dissolved over the years during the global warming phase"; "dethaw the meat" [syn: dissolve, thaw, unfreeze, dethaw, melt]

Usage examples of "unthaw".

She was cold, but the heater in her Bronco would unthaw her hands and feet.

If he ever hoped to unthaw her, he knew he would have to go about it in a different way.

Going to the refrigerator, she pulled out two steaks she had set in it the night before to unthaw, eggs, canned biscuits and milk.

They stopped only to unthaw their hands and feet and warm a little tea.