counterfeit, forgery
贋 centers on something that is not genuine: a counterfeit item or a forgery made to deceive.
贋 combines 雁 (wild goose) with 貝 (shell/money). The wild goose likely contributes the sound ガン, while 貝 relates to money or value, together suggesting something of false value.
A wild goose (雁) is passed off as valuable money (貝) — a clear counterfeit.
For ガン, imagine a gang of counterfeiters passing fake geese as real money: gang -> ガン.
fake (work); counterfeit
genuineness or spuriousness; authenticity; the genuine and the spurious
argument as to (about) the authenticity (of ...)
black locust; robinia pseudoacacia
counterfeiter; faker; appropriationist
counterfeit bill; counterfeit note
counterfeiting; forgery; fabrication
counterfeit paper money
counterfeit money
falsified severed head