get lucky
US /ɡɛt ˈlʌk.i/
UK /ɡɛt ˈlʌk.i/

1.
to have good fortune or success by chance
:
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We really got lucky with the weather on our vacation.
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He got lucky and found a parking spot right in front of the building.
2.
to have a sexual encounter, often casually
:
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After the party, he was hoping to get lucky.
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He went to the bar, trying to get lucky.