bread and butter ( synonym found)
Definition of bread and butter:

°Bread spread with butter.
°That which is central or fundamental, as to one's business, survival, or income; a staple or cornerstone.
"They will do some machining if you ask them, but sheet metal has always been their bread and butter."
Definition of bread and butter:

°Bread spread with butter.
°That which is central or fundamental, as to one's business, survival, or income; a staple or cornerstone.
"They will do some machining if you ask them, but sheet metal has always been their bread and butter."
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