To convert or change something into a consonant form, or to emphasize the consonantal aspects of speech.
From consonant plus -ize (Greek -izein, 'to make or do'). This linguistic verb was coined to describe phonological processes where non-consonantal sounds become consonantal.
In some languages, vowels literally turn into consonants over time—like how Latin 'dies' (day) became Spanish 'día'—so consonantize describes a real sound change linguists observe!
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