To get involved or involve oneself, causing disturbance.
To sexually molest, especially of a child.
(of waves) To be correlated with each other when overlapped or superposed.
To strike one foot against the opposite foot or ankle in using the legs.
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.