• a shrill whistle or shout of disapproval made at a public meeting or performance

Synonyms: whistle, boo, hiss, jeer, raspberry, hoot, brickbat, taunt, shout of derision

• make a catcall

Synonyms: taunt, mock, scoff at, ridicule, laugh at, sneer at, deride, tease, insult, abuse, jibe (at), scorn, shout disapproval (at)