A fake or counterfeit work (especially of art); an imitation produced to pass as the genuine piece.
美術館の展示に混じっていた作品が贋作だと判明した。
A piece included in the museum exhibition was found to be a forgery.
彼は有名画家の贋作を本物として高額で売っていた。
He was selling forgeries of a famous painter as genuine works for high prices.
贋作を見抜くためには、専門家の鑑定が必要だ。
To detect forgeries you need an expert appraisal.