0 past simple and past participle of counterfeit
1 to make something look like the original of something else, usually for dishonest or illegal purposes:
Two women and a man have been convicted of counterfeiting $100 bills.
We have made it significantly more difficult for them to counterfeit this document.
49 percent of respondents were aware that drugs and other medicines are counterfeited.
The brothers were surprisingly skilled at the fine detail work required to counterfeit coins.
The department added high-tech features designed to make it more difficult to counterfeit the note.
