Pronunciation: [dˈə͡ʊst ðə slˈa͡ɪ] (IPA)
Correct spelling for the English word "doest the sly" is [dˈə͡ʊst ðə slˈa͡ɪ], [dˈəʊst ðə slˈaɪ], [d_ˈəʊ_s_t ð_ə s_l_ˈaɪ] (IPA phonetic alphabet).