to deny a person on a standby list due to lack of space.
to unload.
to get rid of things, work, or problems by passing them on to someone or something else.
to change a passengers' ticket status from "checked in" to "open", allowing further changes. (This applies regardless of whether the passenger has boarded the aircraft or not).
to pass the ball.
The act of offloading something, or diverting it elsewhere.
The act of passing the ball to a team mate when tackled.