The term 'seize by legal authority' can be summarized as an ARREST, which is a 6-letter word. An ARREST is the act of apprehending or taking into custody a person by legal authority, such as a police officer. It is usually done when a person is suspected of committing a crime or is in violation of the law. The purpose of an ARREST is to bring the suspect before a court or other legal authority for trial and possible punishment.