UNDERSTAIRS

\ˌʌndəstˈe͡əz], \ˌʌndəstˈe‍əz], \ˌʌ_n_d_ə_s_t_ˈeə_z]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.