will have been hissing

• future perfect progressive

  future perfect progressive

  Used to describe a continuous action that will progress up until a designated point of completion in the future.

  of hiss.
  hiss

  verb (used without object)

  to make or emit a sharp sound like that of the letter s prolonged, as a snake does, or as steam does when forced under pressure through a small opening.

Related Words

• boo
• hoot
• jeer
• seethe
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• wheeze
• whirr
• whisper
• whistle