defog

[dee-fog, -fawg]
verb (used with object), defogged, defogging.
1.
to remove the fog or moisture from (a car window, mirror, etc.).
2.
Informal. to make intelligible, specific, or obvious; clarify: In a lengthy interview the mayor defogged the issues in the transit strike.

Origin:
1900–05; de- + fog1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
One rheostat controls the main air-conditioning fan flow rate, and a second rheostat controls the window defog fan velocity.
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