Pronunciation: [wˈɪðəwˌɪn] (IPA)
Correct spelling for the English word "witherwin" is [wˈɪðəwˌɪn], [wˈɪðəwˌɪn], [w_ˈɪ_ð_ə_w_ˌɪ_n] (IPA phonetic alphabet).