Pronunciation: [wˈɜːt ˈɒf] (IPA)
Correct spelling for the English word "wert off" is [wˈɜːt ˈɒf], [wˈɜːt ˈɒf], [w_ˈɜː_t ˈɒ_f] (IPA phonetic alphabet).
Correct spelling for wert off