Pronunciation: [ˈʌmstɹə͡ʊk] (IPA)
Correct spelling for the English word "umstroke" is [ˈʌmstɹə͡ʊk], [ˈʌmstɹəʊk], [ˈʌ_m_s_t_ɹ_əʊ_k] (IPA phonetic alphabet).