Webster's Revised Unabridged Dictionary · 1913

Oust

Oust , noun

See Oast.

Oust , transitive verb

[Old French oster, French ôter, prob. from Latin obstare to oppose, hence, to forbid, take away. See Obstacle, and compare Ouster.]

1.
To take away; to remove.
Multiplication of actions upon the case were rare, formerly, and thereby wager of law ousted. — Sir M. Hale
2.
To eject; to expel; to turn out. — Blackstone
From mine own earldom foully ousted me. — Tennyson