Gravy-train definitions

An occupation or other source of income that requires little effort while yielding considerable profit.
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A sinecure, subsidy, etc. that allows one to live luxuriously without much work.
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(idiomatic) An occupation or any lucrative endeavor that generates considerable income whilst requiring little effort and carrying little risk.
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(idiomatic, politics) A gorging on luxuries, since someone else foots the bill.
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Origin of gravy-train

The word gravy by itself was used prior to any attestable use of gravy train to characterise 'cushy' situations. It is a shortening of the phrase riding the gravy train, rather than train referring to a number of individuals going the same way or a way of teaching people.