Pronunciation: [dˈɪdst ðə slˈa͡ɪ] (IPA)
Correct spelling for the English word "didst the sly" is [dˈɪdst ðə slˈa͡ɪ], [dˈɪdst ðə slˈaɪ], [d_ˈɪ_d_s_t ð_ə s_l_ˈaɪ] (IPA phonetic alphabet).