To kill (a person or animal).
To exclude (from investigation or from further competition).
To completely remove, get rid of, put an end to.
To record amounts in a consolidation statement to remove the effects of inter-company transactions.
To excrete (waste products).
To keep safe; to defend; to guard; to prevent harm coming to.
To book a passenger on a later flight if there is a chance they will not be able to board their earlier reserved flight.