Glossary entry (derived from question below)
Spanish term
Argentina
Multilingual Experts
Native in: English (Variants: Canadian, UK, US)
Works in: English, Spanish to English, English to Spanish, and 12 more.
chistar
S señala una zona en el techo. Ambos quedan alertas, durante varios segundos, con el oído atento, mirándose de cucheta a cucheta.
bunks.
JOSE (41), el cocinero, pasa entre los camastros y al verlos en esa actitud, les chista.
It's like whistle, but more onomatopoeia
Thanks
| 4 +7 | psst |
AllegroTrans
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| 3 | hiss at |
Adrian MM.
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| chistar |
AllegroTrans
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Non-PRO (2): AllegroTrans, Rachel Fell
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Proposed translations
United Kingdom
Sensible solutions
Native in: English (Variant: Wessexois) 
Works in: French to English, English, English to French
psst
psst (interjection) definition and synonyms | Macmillan Dictionary
https://www.macmillandictionary.com/dictionary/british/psst
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psst - Urban Dictionary
https://www.urbandictionary.com/define.php?term=psst
Used mostly in quiet circumstances to obtain the attention of another person. Occasionally used in a loud, sarcastic tone in a situation that obviously doesn't
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Note added at 28 mins (2019-08-20 21:08:16 GMT)
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Lucio chistó para llamar mi atención y de solapa me pasó un papel.
Lucio said "psst" to get my attention and then passed me a piece of paper on the sly
Austria
Retd.T&I, Barrister & Austro-Advokat
Native in: English (Variants: Scottish, British) 
Works in: Spanish to English, English to Spanish, French to English, and 5 more.
hiss at
| neutral |
AllegroTrans
: do you hiss at someone to get their attention?
8 mins
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Not if you are an Englishman in the Home Counties. Yes, if you are a jinetero or jinetera on Cuba.
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| neutral |
David Hollywood
: not so sure about "hiss" as this would have a different connotation
2 hrs
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my initial idea had been 'mouthed (at)' but the asker's onomatopaeic suggestion had sent me on a different tack.
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| neutral |
neilmac
: I've seen the Spanish habit of going "psst" to attract attention described as hissing by English sources, but I don't think it's an apt translation, due to its negative connotations...
1 day 12 hrs
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| neutral |
MollyRose
: I agree with Neilmac.
1 day 21 hrs
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Reference comments
United Kingdom
Sensible solutions
Native in: English (Variant: Wessexois)
Works in: French to English, English, English to French
chistar
verb
1
Emitir algún sonido como para empezar a hablar.
"metí al loro en un mantel que había sobre una mesa, atando bien las cuatro puntas para que no se moviese ni pudiera chistar, y volví al barco ."
2
Llamar a una persona haciendo un sonido parecido a chis.
Examples of chistar.
metí al loro en un mantel que había sobre una mesa, atando bien las cuatro puntas para que no se moviese ni pudiera chistar, y volví al barco .
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Note added at 25 mins (2019-08-20 21:05:43 GMT)
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a. to say "psst"
Lucio chistó para llamar mi atención y de solapa me pasó un papel.Lucio said "psst" to get my attention and then passed me a piece of paper on the sly.
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