It definitely involved raising and fronting, though it sometimes stalled when the affected object occurred just before an "r." It explains why pairs of words such as "came" and "ram" or "wine" and "Latin" rhyme in Chaucer.
This occurrence was discovered and named by Otto Jespersen and André Martinet coined the names for the two proposed mechanisms of its operation, the "push chain" and the "pull chain," whose advocates still clash. It definitely involved raising and fronting, though it sometimes stalled when the affected object occurred just before an "r." It explains why pairs of words such as "came" and "ram" or "wine" and "Latin" rhyme in Chaucer. For ten points, name this process that took place during the transition from Middle to Early Modern English and changed the sound of all long vowels.
This occurrence was discovered and named by Otto Jespersen and André Martinet coined the names for the two proposed mechanisms of its operation, the "push chain" and the "pull chain," whose advocates still clash.
the Great {Vowel Shift}