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A gatecrasher is a person who goes to a party, a wedding, a concert, or some other gathering without being invited. The act is to gatecrash, or more loosely to crash the party: you walk in as if you belong there. The picture behind the word is the gate — the way in — and someone who pushes through it. It is informal, and the feeling depends on the room. Among friends it can sound cheeky, even funny: you heard there was a party and you just showed up. At a ticketed show or a family wedding, though actually, a gatecrasher is not a joke; people at the door may turn you away. People also stretch it a little: you can gatecrash a meeting or a conversation, meaning you join without being asked. The word names the person, not the night out itself.
不請自來的人、闖宴者
組成gate + crasher. Gate is the entrance. A crasher here is someone who “crashes” — pushes in without being asked. Together: the person who comes in through the gate with no invitation.
原始詞典資料2 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。
gatecrashernoun
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slangA person who enters some event without a ticket or invitation, either by stealth or by deception.
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The groom or one of his groomsmen when partaking in the gatecrashing ritual of a traditional Chinese wedding.
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。