one's bread and butter
01
the main source of a person or business's income
Idiom
例
At the moment, freelancing is her bread and butter while she explores other career options.
Once she establishes her bakery, she hopes it will become her bread and butter for the rest of her life.
bread-and-butter
01
基本的な, 不可欠な
*** providing a basic means of subsistence
例
a bread-and-butter job
基本的な仕事
02
日常的な, 基本的な
*** relating to people's practical, everyday needs and concerns
例
These are hardly the bread-and-butter concerns of struggling farmers.
これらは苦労している農家の基本的な関心事ではありません。
