be onto a good thing
To be in a favorable job, position, or situation that has the potential to become very advantageous, lucrative, useful, etc., in the future. A: "Because I can work from home, I can look after the kids when my wife goes to work." B: "Wow, you're really onto a good thing here! Your new boyfriend seems really sweet—I think you two are onto a good thing. A: "We thought we were onto a good thing when bought this house in 1988." B: "I guess you really were, considering you're still living here."
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