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Discover LudwigSuggestions(5)
'primary source of income' is a grammatically correct and commonly used phrase in written English.
It can be used when referring to a person's or family's main way of earning money. For example: For most of their lives, my parents relied on their primary source of income, a small family business.
Exact(59)
Smuggling is a primary source of income for many.
This is Mr. Weston's primary source of income.
Forestry is also a primary source of income and employment.
As a result, CD sales remain a primary source of income.
(The opium trade is a primary source of income for the Taliban).
This is the primary source of income for myself and my [four] workers," he says.
Football is the primary source of income for most athletic departments.
(She also often received no money, though fossil hunting was the family's primary source of income).
Harvesting oysters used to be his primary source of income, he said, "but for 20 years, it's been dead".
"It would be a scary situation if I was depending on Uber as my primary source of income", he added.
For hundreds of thousands of people living in remote villages, selling yarsagumba has become a primary source of income.
More suggestions(15)
primary source of growth
major source of income
main source of income
key source of income
predominant source of income
primary source of tax
staple source of income
leading source of income
primary source of funding
primary source of enjoyment
primary source of science
primary engine of income
primary source of learning
primary source of spending
primary source of warmth
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com