Pronunciation: [dˈa͡ɪmɪŋ ˈʌp] (IPA)
Correct spelling for the English word "diming up" is [dˈa͡ɪmɪŋ ˈʌp], [dˈaɪmɪŋ ˈʌp], [d_ˈaɪ_m_ɪ_ŋ ˈʌ_p] (IPA phonetic alphabet).