- (obsolete) A sort of moving machine employed in the old pageants.
1604, Ben Jonson, “Part of the King's Entertainment in Passing to His Coronation”, in The Works of Ben Jonson, London: Printed by Thomas Hodgkin, published 1692, page 306:
- In the Centre, or midst of the Pegm, there was an Aback, or Square, wherein this Elogy was written.
Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.