SUSTAINING

\səstˈe͡ɪnɪŋ], \səstˈe‍ɪnɪŋ], \s_ə_s_t_ˈeɪ_n_ɪ_ŋ]\
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1874 - Etymological and pronouncing dictionary of the English language
By Stormonth, James, Phelp, P. H.