noun
income obtained with a minimum of effort
• Syn: ↑easy money
• Hypernyms: ↑income
* * *
noun, pl ⋯ trains [count]
informal : something (such as a business or a government program) that provides money to many people without requiring much work or effort
They're trying to get on board the gravy train.
ride the gravy train
* * *
a situation where people seem to be making a lot of money without much effort
Useful english dictionary. 2012.