fully well vs full well : Common Errors in English

About fully well vs full well

Back in the Middle Ages and Renaissance it was common for “full” to modify adverbs. The only instance in which this continues today is the traditional phrase “full well,” mostly in “knowing full well.” People who “correct” this to “knowing fully well” may have modern grammar on their side, but they sound as if they aren’t acquainted with the standard idiom.

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