Definition: the act of tapping a telephone or telegraph line to get information
Similar words: investigating, investigation
Definition: the work of inquiring into something thoroughly and systematically
Synonyms: wiretap, tap, bug, intercept
Definition: tap a telephone or telegraph wire to get information
Usage: The FBI was tapping the phone line of the suspected spy; Is this hotel room bugged?
Similar words: eavesdrop, listen in
Definition: listen without the speaker's knowledge
Usage: the jealous man was eavesdropping on his wife's conversations