(your) bread and butter Meaning Your bread and butter is you | English Language

(your) bread and butter

Meaning
Your bread and butter is your livelihood or the source of your income.

For example

Bartending is my bread and butter at the moment, but I'm trying to get into acting.

The conditions are bad, but this work is their bread and butter so make sure the workers have other jobs before you close down the factory.
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