尖团音的合流
中古时期的见溪群晓匣和精清从心邪原来是两套声母。18世纪中叶清人《圆音正考》一书中，这两组声母在细音（齐撮两呼）前合为一类。读成[tɕ][
][ɕ]，现代汉语普通话也是如此，如“精”、“经”原不同音，今同音。这种现象称为尖团音合流，也称为尖团不分或不分尖团。一般认为是团音先舌面化，然后尖音也舌面化，二者发生合流，原因是受韵母的舌面元音高化的影响。
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