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“Psst” is less a word with a meaning than a sound. You make a short, quiet through the teeth when you want one person to look at you, but you do not want the whole room to hear. It is what you do in a library, in class, or in a queue when you need a friend’s attention. In stories it is written as dialogue: “Psst! Over here.” Though actually, people also use it as a light verb: she psst-ed at him from the doorway. It is informal, a little secret, and a little rude if you do it to a stranger.
小聲喚人的「欸」（不是叫人安靜的「噓」）
組成Not built from pieces. It copies the sound people make — the same kind of quiet hiss some people use to call a cat.
原始詞典資料5 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
psstintj/psː(t)/
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Used to call animals.
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Used to request silence.
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Used to imply that the speaker is sending secret or whispered information to another person.
- Psst, John, don’t tell anyone, but I’ve got lots of candy stashed away.
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Imitating a spray.
psstverb/psː(t)/
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informalTo say psst, to get someone's attention or to communicate with them.
- and I was just rounding the fourth-floor landing when Claudia pssted at me
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。