/iz"euhnt/contraction of is not.Usage. See contraction.Pronunciation. ISN'T is often pronounced /id"nt/ in the South Midland and Southern U.S., with /d/, a stop consonant, substituting for /z/, a sibilant. This substitution results from an assimilatory process in which the tip of the tongue, in anticipation of the articulatory position for the following /n/, touches the upper alveolar ridge. This same process gives /wud"nt/ for WASN'T and /bid"nis/ for BUSINESS. These pronunciations are heard from speakers on all social levels.
* * *