harmonica bug (English, noun)
expansion: harmonica bug (plural harmonica bugs)
Senses:
glosses: An electronic eavesdropping device (bug) that attaches to a landline telephone and is activated or deactivated by a specific tone. When activated, it prevents the telephone from ringing but activates its microphone to transmit to another telephone at a remote location.
Forms:
form: harmonica bugs
tags: plural