stroke of bad luck
noun phraseUK /strəʊk əv bæd lʌk/
US /stroʊk əv bæd lʌk/
A bad thing that happens just because you were unlucky.
Losing my wallet on the bus was a real stroke of bad luck.
OTHER MEANINGS
2. An unlucky event that ruins plans you had made.
Rain on the day of the picnic was a stroke of bad luck.
3. A small accident that causes trouble at the wrong time.
Breaking a shoelace before the race was a stroke of bad luck.
4. A moment when fortune turns against someone.
The team's star player got hurt, a stroke of bad luck for the whole season.