Pronunciation: [ɡˈat ˌʌp ˈɒn] (IPA)
Correct spelling for the English word "gat up on" is [ɡˈat ˌʌp ˈɒn], [ɡˈat ˌʌp ˈɒn], [ɡ_ˈa_t ˌʌ_p ˈɒ_n] (IPA phonetic alphabet).
Correct spelling for gat up on