good luck

idiom

Definition of good luck 

1 used to say that one hopes someone will succeed We're sorry that you're leaving. Good luck in your new job.

2 informal used to say that one thinks what someone is trying to do is difficult or impossible "I'm planning to ask for a raise." "Oh, really? Well, good luck (to you)."

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Britannica English: Translation of good luck for Arabic Speakers

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