The act of tricking or deceiving someone, or the state of being deceived.
Formed from the verb 'gull' (to deceive) plus the suffix '-age' (which creates nouns indicating action or state). This follows the medieval English pattern of creating abstract nouns from verbs.
The '-age' suffix is incredibly productive in English—it gave us 'package,' 'damage,' 'marriage,' and 'gullage' all the same way, showing how old word-building patterns keep working centuries later.
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