Pronunciation: [hˈadst lˈɒk ˈɒn] (IPA)
Correct spelling for the English word "hadst lock on" is [hˈadst lˈɒk ˈɒn], [hˈadst lˈɒk ˈɒn], [h_ˈa_d_s_t l_ˈɒ_k ˈɒ_n] (IPA phonetic alphabet).