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Phrase(s): Good luck!
1. a wish of good luck to someone. • Mary: I have my recital tonight. Jane: I know you’ll do well. Good luck! • Sally: I hear you’re leaving for your new job tomorrow morning. Bob: That’s right. Sally: Well, good luck! 2. You will certainly need luck, but it probably will not work. (Sarcastic.) • Bill: I’m going to try to get this tax bill lowered. Sue: Good luck! • Bill: I’m sure I can get this cheaper at another store. Clerk: Good luck!
McGrawhill's American Idioms And Phrasal Verbs