Th-alveolarization

Background
Th-alvealarization is a process that occurs in some African varieties of English where the dental fricatives /ð, θ/ merge with the alveolar stops /z, s/. It is also very common amongst native speakers of French (which has no sound comparable to ð or θ) when speaking English, to the point of being a stereotype.

For some speakers of African American Vernacular English, /θ/ is alveolarized to /s/ when it occurs at the end of a syllable and within a word before another consonant leading to such pronunciations as the following.

See also
 * List of Th-alveolarization homographs
 * Phonemic Disorders