- a shrill, whistlelike sound or loud raucous shout made to express disapproval at a theater, meeting, etc.
- an instrument for producing such a sound.
- to sound catcalls.
- to express disapproval of by catcalls.
- a shrill whistle or cry expressing disapproval, as at a public meeting, etc
- to utter such a call (at); deride with catcalls
