Pronunciation: [hˈe͡ɪst bˈɪɡ mˈa͡ʊθ] (IPA)
Correct spelling for the English word "hast big mouth" is [hˈe͡ɪst bˈɪɡ mˈa͡ʊθ], [hˈeɪst bˈɪɡ mˈaʊθ], [h_ˈeɪ_s_t b_ˈɪ_ɡ m_ˈaʊ_θ] (IPA phonetic alphabet).