Artificial intelligent assistant

astrain

aˈstrain, v. Obs.
  Also 4–5 astreyn, 5 estrayne.
  [a. OF. astreign- stem of astreindre, astraindre:—L. astringĕre to astringe.]
  To bind; to put under obligation; to restrain.

c 1400 Apol. Loll. 52 He may astreyn himsilf a ȝer to dwel wiþ a man to serue him. 1483 Caxton Gold. Leg. 363/4 Jhesus..was taken, estrayned, haled forth, and mocked. 1594 Carew Tasso (1881) 108 And free in place Will die, ere base cord hand and foot astraine.

Oxford English Dictionary

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