Artificial intelligent assistant

rere-demain

rere-demain Obs. rare.
  In 6 -mayne, -maine.
  [Later form of rere-main; the reason of the de is not clear.]
  A back-handed stroke.

a 1548 Hall Chron., Rich. III 35 b, But al such plagues, calamities and troubles..I shall with a reredemayne..make them rebounde to our commen enemye. 1591 Harington Orl. Fur. xvi. l, Such a blow he lent him as he past, Vpon his shoulders, from the reredemaine. Ibid. xlii. xlvii, Right blowes and reardemaine he striketh many.

Oxford English Dictionary

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