How to Say "hissing" in Spanish
The Spanish word for “hissing” is “silbido” — A2 level.

Examples
El árbitro terminó el partido con un silbido fuerte.
The referee ended the game with a loud whistle.
Escuché el silbido del viento entre los árboles.
I heard the whistling of the wind among the trees.
La tetera anunció que el agua hervía con un pequeño silbido.
The kettle announced the water was boiling with a little whistle.
Making Actions from Sounds
This word ends in -ido, which is a common way in Spanish to turn an action into a noun that describes the sound of that action.
Using 'Dar' for Sounds
In Spanish, you don't 'make' a whistle; you 'give' it. Use the verb 'dar' followed by 'un silbido'.
Don't confuse with the instrument
Mistake: “Usó el silbido para empezar el juego.”
Correction: Usó el silbato para empezar el juego.
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