LISTEN IN Synonyms

• enter uninvited

• enter unlawfully on someone's property

• search or inquire in a meddlesome way

• thrust oneself in as if by force

• an ironclad vessel built by Federal forces to do battle with the Merrimac

• someone who supervises (an examination)

• someone who gives a warning so that a mistake can be avoided

• display produced by a device that takes signals and displays them on a television screen or a computer monitor

• electronic equipment that is used to check the quality or content of electronic transmissions

• a piece of electronic equipment that keeps track of the operation of a system continuously and warns of trouble

• any of various large tropical carnivorous lizards of Africa and Asia and Australia; fabled to warn of crocodiles

• keep tabs on; keep an eye on; keep under surveillance

• check, track, or observe by means of a receiver

• hear, usually without the knowledge of the speakers

• (military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors

• a secret watcher; someone who secretly watches other people

• catch sight of

• watch, observe, or inquire secretly

• catch sight of; to perceive with the eyes

• secretly collect sensitive or classified information; engage in espionage

• the act of tapping a telephone or telegraph line to get information

• tap a telephone or telegraph wire to get information