"My best friend is on the gravy ..... now. He wrote three best-selling novels and makes more on the royalties a year than I have in the past ten years," Tom told his parents

[Englishlearner]

"My best friend is on the gravy ..... now. He wrote three best-selling novels and makes more on the royalties a year than I have in the past ten years," Tom told his parents. (*) line (*) train (*) diet (*) factory

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This is a companion discussion topic for the original entry at https://english.best/questions/12202,my-best-friend-is-on-the-gravy-___-now-he-wrote-three-best-selling-novels-and-makes-more-on-the-royalties-a-year-than-i-have-in-the-past-ten-years-tom-told-his-parents/

[Cristovam]

I answered “gravy train” because it was the unique that made sense. Am I right?

[Torsten]

Yes, to be on the gravy train is an idiom. Do you know what it means?