Fronting (sound change)

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In phonology, fronting is a sound change in which a vowel or consonant becomes fronted, advanced or pronounced further to the front of the vocal tract than some reference point. The opposite situation, in which a sound becomes pronounced further to the back of the vocal tract, is called backing or retraction. Fronting may be triggered by a nearby sound, in which case it is a form of assimilation, or may occur on its own.