The phrase "main breadwinner" refers to the person in a family or household who earns the most money and financially supports the others. Full definition
It's less likely to be viable if there's one main breadwinner in the house. (money.stackexchange.com)
Also, if you're the sole or main breadwinner of your household, invest in life insurance to prevent a financial crisis for your dependents in case you're no longer in the picture. (wisebread.com)
This means moving away from a family with one main breadwinner while the other works part time. (newlawjournal.co.uk)