α. see a- prefix1 and fell v.; also south-western Middle English affulde (past tense), Middle English affulle, Middle English afulde (past tense).
β. early Middle English afalle (south-west midlands and south-western), early Middle English aualde (past tense, south-west midlands), early Middle English aualle (south-west midlands), early Middle English avalle (south-west midlands).