I. ˈ ̷ ̷ˌ ̷ ̷ noun
1.
a. : a small instrument for producing a sound like the cry of a cat formerly used especially in theaters to express disapproval or contempt
b. : the sound made by this instrument
c. : a similar sound made by the human voice
2. : a loud or raucous cry expressing disapproval (as at a political gathering)
II. transitive verb
: to deride or assail with catcalls : express disapproval of by catcalls
intransitive verb
: to sound catcalls (as at a theater)
the audience booed and catcalled