To thaw something that is frozen, or metaphorically to end a blockage or restriction.
From Old English 'un-' (reversal prefix) combined with 'freeze,' a word of unknown origin but possibly related to frost and cold.
When water 'unfreezes,' it's not just melting—ice actually becomes less dense than liquid water, which is why ice floats, a property that's crucial for aquatic life under frozen lakes.
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