Pronunciation: [ˌɒnɪŋ tˈɒp ɒv] (IPA)
Correct spelling for the English word "onning top of" is [ˌɒnɪŋ tˈɒp ɒv], [ˌɒnɪŋ tˈɒp ɒv], [ˌɒ_n_ɪ_ŋ t_ˈɒ_p ɒ_v] (IPA phonetic alphabet).