lucky strike—
1. a fortunate discovery:
- Would they … come back to civilization with the story of a lucky strike to account for the gold they brought?
2. a chance piece of good fortune:
- It was a lucky strike that we were able to land so close to the boat, so we could follow the plan.
stroke of luck — = lucky strike 2:
- My son was going over there anyway, so it was just a stroke of luck that they ended up being so close together.