is duping
Present progressive he/she conjugation of dupe.

dupe

US
SpanishDictionary.com Phonetic Alphabet (SPA)
dup
International Phonetic Alphabet (IPA)
dup
English Alphabet (ABC)
dupe
UK
SpanishDictionary.com Phonetic Alphabet (SPA)
dup
International Phonetic Alphabet (IPA)
dup
English Alphabet (ABC)
dupe
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