Emily Dickinson Lexicon

OUST, v.t. [Fr. ôter, for ouster. It seems to be a contracted word, for in Norman, oghsta is ousted. I take this to be our vulgar oost, used in the sense of lift. The usual signification then will be that of the Latin tollo, sustuli.]

1. To take away; to remove. Multiplications of actions upon the case were rare formerly, and thereby wager of law ousted. Hall.
2. To eject; to disseize. Afterward the lessor, reversioner or remainder-man or any stranger doth eject or oust the lessee of his term. Blackstone.