Artificial intelligent assistant

prison-bar

ˈprison-ˈbar
  a. pl. The iron bars by which a prison, its door, windows, etc., are made fast; bars which imprison. b. prison-bars, a game: see prisoners' bars.

1844 Welby Poems (1867) 86 Yet from my prison-bars A narrow strip of sky is all I see. 1860 Emerson Cond. Life, Worship Wks. (Bohn) II. 393 He to captivity was sold, But him no prison-bars would hold.

Oxford English Dictionary

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