Pronunciation: [hˈe͡ɪst ˈʌp] (IPA)
Correct spelling for the English word "hast up" is [hˈe͡ɪst ˈʌp], [hˈeɪst ˈʌp], [h_ˈeɪ_s_t ˈʌ_p] (IPA phonetic alphabet).