1) Basic 2) Basic meal 3) Basic side dish 4) Bread spread with butter 5) Edible staples 6) Kind of pickle 7) Like a thank-you letter 8) Livelihood duo 9) Pertaining to basic needs 10) Primary source of income 11) Source of livelihood 12) Table mates 
[superstition] `Bread and butter` is a superstitious blessing or charm, typically said by young couples or friends walking together when they are forced to separate by an obstacle, such as a pole or another person. By saying the phrase, the bad luck of letting something come between them is thought to be averted. Both walkers must say the p...
The main source of income of a company or an individual
Bread and butter is London Cockney rhyming slang for gutter.
bread spread with butter. · a basic means of support; source of livelihood; sustenance: The automobile industry is the bread and butter of many Detroiters.