Obs. rare. [Cf. BUM-CARD.] A leaf of paper with a slip projecting from the edge (in a book used for a conjuring trick); it served a similar purpose to that of the ‘bum-card,’ being intended to enable the conjuror to open the book, as if by accident, at the right places.
1584. R. Scot, Discov. Witchcr., XIII. xxxiii. 283. Each Bumleafe or high inch of paper … rest your thombe upon anie of those Bumleaves, or high inches.
