luck out
luck out {v. phr.}, {slang}, {informal}
1. Suddenly to get lucky when in fact the odds are against one's succeeding.
I was sure I was going to miss the train as I was three minutes late, but I lucked out, the train was five minutes late.
2. To be extraordinarily fortunate.
Catwallender really lucked out at Las Vegas last month; he came home with $10,000 in cash.
3. (By sarcastic opposition) to be extremely unfortunate; to be killed.
Those poor marines sure lucked out in Saigon, didn't they?
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Source: A Dictionary of American Idioms