Artificial intelligent assistant

sword-brother

sword-brother Obs.
  [f. sword n. + brother n. Cf. MLG. swertbroder, MHG. swertbruoder (G. schwertbruder Hist.), MDa. sværdbroder = sword-bearer e.]
  A comrade in arms.

c 1205 Lay. 4144 Ich wulle mine rihte faren to stal fehte to-gene þene swerd broþeren þe beiene beoh for-sworne. Ibid. 30523 He bigon þene swikedom uppen his sweord broþeren.

Oxford English Dictionary

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