oust (verb) - to eject from a position; to force or drive out [oust]
BREAKDOWN: OB- (off, against) + -ST (stand)
ouster is the act, state, or agent of expulsion or removal
See also: sequester
“To make my body a temple pure,
Wherein I dwell serene;
To care for the things that shall endure,
The simple, sweet and clean.
To oust out envy and hate and rage,
To breathe with no alarm;
For Nature shall be my anchorage,
And none shall do me harm.” —Robert W. Service