1.Definition: a cry or noise made to express displeasure or contempt

Related Noun(s):bird, boo, hoot, raspberry, razz, snort

Category: General

2.Definition: a fricative sound (especially as an expression of disapproval)

"The performers could not be heard over the hissing of the audience"

Related Noun(s):fizzle, hissing, hushing, sibilation

Category: General