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self-slain

self-slain, pa. pple. and ppl. a.
  [self- 2.]
  Slain by one's own hand.

1814 Byron Devil's Drive i, Sausages made of a self-slain Jew. 1883 L. Morris Songs Unsung 27 Being self-slain and numbered with the dead.

  So self-ˈslayer, self-murderer.

1690 C. Nesse Hist. & Myst. O. & N. Test. I. 212 Thou art..a felo-de-se or self-slayer. 1823 in Cobbett Rur. Rides (1885) I. 390 They have, since Castlereagh cut his throat, relieved self-slayers from the disgrace of the cross-road burial. 1845 Bailey Festus 254 Let it not be said He sought his God in the self-slayer's way.

Oxford English Dictionary

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