different between mayfall vs mayhappen

English

mayhappen (not comparable)

(obsolete or dialect) maybe, perhaps.
- 1891, William Morris, The Story of the Glittering Plain
  […] they hastened up, and presently stood before that cavern's mouth with doubt and joy mingled in their minds; for now, mayhappen, they had reached the gate of the Glittering Plain, or mayhappen the gate of death.

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