To produce a sound in a dental manner (with the tongue against the upper front teeth) or to transform a sound into a dental sound.
From dental (from Latin 'dentalis', relating to teeth) combined with -ise suffix (British spelling of -ize, from -izare meaning to make or cause to be). Phonetic terminology from 20th century linguistics.
When linguists talk about dentalising a sound, they're describing tiny shifts in how people pronounce things—these micro-changes are happening in every language right now and are how accents diverge and new dialects form over time.
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