Gradual Sound Change
Language evolution proceeds through small, pronounceable intermediate changes rather than implausibly large jumps.
Episodes that teach this
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Proto-Indo-European: The Mother of All Languages | Future IQ
· explained at 9:34
17,358 views
it has to be a small change. Okay? It can't be a big change.
Examples & generalisations
Concrete examples: a consonant cluster becoming a doubled consonant and then a single consonant