To have a strike of bad luck, or it seems like things aren't going well. “James seems down on his luck these days. He lost his job and then his girlfriend.”
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You should be so lucky
A sarcastic way of saying that whatever you are talking about is highly unlikely to happen. “I entered the competition to win a car. Ha! You should be lucky!"
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Born under a lucky star
When someone seems to be very fortunate.“I can’t believe that Dave is being fast-tracked to the management position. He really was born under a lucky star!"
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Third time's the charm
After failing at something twice, you will succeed on the third try. “Yes, I’m so glad that worked. The third time really is the charm!"
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The best of the British to you
Wishing someone good luck even though you believe they may not be successful. “You’re going to ask for a raise? The best of British to you!”