以假乱真
yíjiǎ-luànzhēnTraditional 以假亂真
to pass off the fake as genuine
Every meaning
yǐjiǎ-luànzhēn
- to pass off the fake as genuine
Its characters
Words with 以
Words with 假
Meanings from our own dictionary. Chengyu from the Xinhua idiom list, the most common first.