To corrupt or profane
To violate sexually; to debauch; to dishonour.
To make something harmful, especially by the addition of some unwanted product.
To make something or somewhere less suitable for some activity, especially by the introduction of some unnatural factor.
Polluted; defiled.
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.