one's bread and butter
01
the main source of a person or business's income
Idiom
例
When he was younger, acting was his bread and butter, and it provided for all his needs.
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。
