1 buzz, hissing, sibilance, sibilation
2 boo, catcall, contempt, derision, jeer, raspberry
3 rasp, shrill, sibilate, wheeze, whirr, whistle, whiz
4 blow a raspberry, boo, catcall, condemn, damn, decry, deride, hoot, jeer, mock, revile, ridicule
English Collins Dictionary - English synonyms & Thesaurus
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"