Also means
boo (an audience)
Usage Note
Siffler covers both producing a whistle and being hissed by a crowd — context separates the two senses. The noun sifflet is a whistle (the object or sound), and coup de sifflet is a referee's whistle blast. Siffler un acteur means to boo a performer off stage.
Examples
"L'arbitre a sifflé la fin du match."
Natural Translation
The referee whistled the end of the match.

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