To hiss is to make a long s sound. Snakes are known to hiss, and sometimes unhappy audience members will hiss instead of booing.

The sound you make when you hiss — also called a hiss — sounds just like the word itself. In fact, you can't say the word without hissing. This type of sound is also known as sibilance, a consonant that's pronounced when a stream of air passes through teeth that are touching or close together. A barista's steaming wand hisses as she foams milk, and some types of snakes hiss in warning.

Definitions of hiss
  1. verb
    make a sharp hissing sound, as if to show disapproval
    synonyms: sibilate, siss, sizz
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    type of:
    emit, let loose, let out, utter
    express audibly; utter sounds (not necessarily words)
  2. verb
    show displeasure, as after a performance or speech
    synonyms: boo
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    acclaim, applaud, clap, spat
    clap one's hands or shout after performances to indicate approval
    type of:
    declare or judge unfit for use or habitation
  3. verb
    express or utter with a hiss
    synonyms: sibilate, siss, sizz
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    type of:
    mouth, speak, talk, utter, verbalise, verbalize
    express in speech
  4. verb
    move with a whooshing sound
    synonyms: whoosh
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    type of:
    go, locomote, move, travel
    change location; move, travel, or proceed, also metaphorically
  5. noun
    a fricative sound (especially as an expression of disapproval)
    synonyms: fizzle, hissing, hushing, sibilation
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    type of:
    sound of any kind (especially unintelligible or dissonant sound)
  6. noun
    a cry or noise made to express displeasure or contempt
    synonyms: Bronx cheer, bird, boo, hoot, raspberry, razz, razzing, snort
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    type of:
    call, cry, outcry, shout, vociferation, yell
    a loud utterance; often in protest or opposition
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