Je ne sais pas siffler - I don't know how to whistle.
J'espère que ce n'est pas un serpent qui vient de siffler - I hope that's not a snake that just hissed.
Related: le sifflement - whistling, hissing, wheezing; sifflant (adj) - whistling, hissing, wheezing; un sifflet - whistle; un siffleur - whistler, hisser
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Pronunciation: [see flay]Â