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.
To assume, adopt or affect; to behave in a particular way as a pretense.
To don (clothing, equipment, or the like).
To initiate cooking or warming, especially on a stovetop.
To perform for an audience.
To organize a performance for an audience.
To fool, kid, deceive.
Used other than figuratively or idiomatically: see put, on.
To bet on.
To play (a recording).