Pronunciation: [djˈuːplɪfˌa͡ɪɪŋ] (IPA)
Correct spelling for the English word "duplifying" is [djˈuːplɪfˌa͡ɪɪŋ], [djˈuːplɪfˌaɪɪŋ], [d_j_ˈuː_p_l_ɪ_f_ˌaɪ_ɪ_ŋ] (IPA phonetic alphabet).