The reading ぎぞう uses the common On'yomi for 偽 (ギ) and 造 (ゾウ). Wrong readings like ぎぞ or ぎさ are incorrect for 偽 or 造, which consistently take their standard sounds in compounds. This word denotes the act of creating a false copy, like currency or documents, with intent to deceive.

「ぎぞう」は偽（ギ）と造（ゾウ）の一般的な音読みです。「ぎぞ」や「ぎさ」は誤った読みです。通貨や文書などを本物のように偽って作成する行為を指します。