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To flub something is to do it badly by mistake — often something you should have got right. Actors flub a line. A speaker flubs a name. A player flubs an easy catch. It is spoken American English, a little old-fashioned now, but people still say it. It is not a huge disaster; it is a miss. You can also call the miss itself a flub. British speakers often say fluff a line instead, with almost the same feeling.
搞砸、講砸（美式口語）
組成It does not split into pieces. It first appeared in American English as a verb around 1924, and as a noun around 1953. It was possibly suggested by the sound of fluff and flop.
原始詞典資料3 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。
flubnoun/flʌb/
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informalAn error; a mistake in the performance of an action.
- 1962 November 6, Richard Nixon, “Gentlemen, this is my last press conference”, 2008, Rick Perlstein (editor), Richard Nixon: Speeches, Writings, Documents, page 111, I made a talk on television, a talk in which I made a flub—one of the few that I make, not because I′m so good on television but because I′ve been doing it a long time. I made a flub in which I said I was running for governor of the United States.
- A flub can be a slight cinematic slip-up or a major gaffe.
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slangA fold of fat.
flubverb/flʌb/
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informalTo goof, fumble, or err in the performance of an action.
- ‘Stage fright? So? What are you babbling ′bout? You′re mad as a snake!’ ‘Ever since I was a kid. I was in the Christmas Pageant one year and flubbed my line.’ ‘What was your line?’ ‘I told you I flubbed it!’ he mouthed these words hysterically.
- The actor that detained her had one line in that particular scene and flubbed it. And then flubbed it again...and again. And again, all the while assuring the director and the crew that he ‘knew his lines’ and then flubbed them again.
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。