From Longman Dictionary of Contemporary Englishstrike goldstrike goldinformal to do something that makes you a lot of money Jackie eventually struck gold with her third novel. → strike
Examples from the Corpus
strike gold• Oxford City Women's cross country team has struck gold.• That's where I struck gold.• Within a week of returning he had struck gold.• Twigg, the reigning world champ in pursuit, should strike gold again.• They struck gold in Kalgorlie in 1893. 100 years on and they're celebrating another major rush.• It was like striking gold or falling rapturously in love: he possessed secret knowledge that his Germantown friends could scarcely imagine.• You really have struck gold there. 