to be in a situation where one makes a lot of money with little effort
少ない努力で大量のお金を得る状況にあること (Sukunai doryoku de tairyo no okane o eru jōkyō ni aru koto)
"He’s been riding on the gravy train since he took over the family business."
"彼は家族経営を引き継いでからずっとオン ザ グレイヴィー トレインに乗っている。" (Kare wa kazoku keiei o hiki tsuide kara zutto **on za gureivī torein** ni notte iru.)
to keep one's plans or intentions secret
to support or defend something you believe in
a leader with a clear vision for the future
something very complicated or difficult to understand
to make a sincere promise, often used by children
to help someone out of a difficult situation
