(Counterfeit is usually an adjective meaning faked or forged. It can also be used as a verb, meaning to fake or forge.
(adjective) "Most of the gold watches sold on the street are counterfeit."
(verb): "Many criminals over the years have tried to counterfeit US bills."
(verb): "Although she actually disliked her uncle, she was able to counterfeit tears at his funeral."
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The bill was genuine and not counterfeit.
Criminals have tried to counterfeit US bills over the years. - Verb
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