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A slapper is a very rude British word for a woman who has sex with many people. It is an insult, meant to shame, not a calm description. You may hear it in some British speech and in films; you should not use it about a real person. It is mainly British. American English does not use slapper this way. Though actually, the pieces look like slap + -er, as if it meant 'someone who slaps'. For this rude meaning, some scholars guess it comes from schlepper, a sloppy or woman — but that is only a guess, and you do not need the guess to understand the insult.
蕩婦（英式極冒犯的罵人話；不是中性說法）
組成Looks like slap + -er. For this insulting sense, the origin is uncertain; a tentative guess links it to Yiddish schlepper.
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。
slappernoun/ˈslæpɚ/
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One who, or that which, slaps.
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slangA prostitute.
- A fella looking dapper / And he's sittin' with a slapper / Then I see it's a pimp / And his crack whore
- You've got a photo of the dead grandad, no pic of the blonde slapper?
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slangA woman of loose morals.
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governmentmilitarypoliticsA type of detonator which uses a powerful surge of electricity to vaporize a thin metal foil, propelling a larger piece of plastic film at a speed high enough to detonate an explosive upon impact.
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archaicslangAnything monstrous; a whopper.
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。