Definition of Canadian raising in US English:

Canadian raising

noun

Phonetics
  • A sound change in some varieties of North American English in which the first element of the diphthongs/aʊ/ and/aɪ/ is raised before voiceless consonants (as in the words mouth and price), giving the diphthongs/ʌʊ/ and/ʌɪ/.

Origin

1970s; earliest use found in Canadian Journal of Linguistics.