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From The Collaborative International Dictionary of English v.0.48:
Oust \Oust\, v. t. [imp. & p. p. Ousted; p. pr. & vb. n. Ousting.] [OF. oster, F. [^o]ter, prob. fr. L. obstare to oppose, hence, to forbid, take away. See Obstacle, and cf. Ouster.] 1. To take away; to remove. [1913 Webster] Multiplication of actions upon the case were rare, formerly, and thereby wager of law ousted. --Sir M. Hale. [1913 Webster] 2. To eject; to expel; to turn out. --Blackstone. [1913 Webster] From mine own earldom foully ousted me. --Tennyson. [1913 Webster]