What is Unthaw?
1.
To freeze. Often used as a synonym for thaw or defreeze, although this is hideously incorrect. It actually means the opposite, when taken literally. Don't argue it. You are wrong.
Pete "The pizza was frozen so I let it unthaw for half an hour."
Willy "Get the fuck out of here you hick. And for the record, it's 'thaw'."
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