To take a side in a dispute.
To substitute for; to replace; (theater) to serve as an understudy.
To make one of a party in a bet or other speculation.
A substitute; a replacement.
To remove from some (especially political) position or office; to dethrone.
To cause something to be removed or replaced in its role; to displace, overturn.
To upset the composure of (in various ways); to astound, shock, or unsettle.
To come out or off of a seat.
To remove or dislodge from a seat (especially referring to horse riding).