名詞 bread-and-butter:

1. the financial means whereby one lives
   同義詞：support, keep, livelihood, living, bread and butter, sustenance

bread-and-but.ter

adj.（形容詞）

Influenced by or undertaken out of necessity:
謀生的，為了糊口的：受生活需求支配或承擔(dān)的：
例句：
a bread-and-butter job.
一份糊口的工作

Reliable, especially for producing income; basic:
賴以為生的：可依靠的，尤指做為收入來源的；基本的：
例句：
Household appliances are the company`s bread-and-butter goods.
家庭用具是這家公司的主要商品

Expressive of gratitude for hospitality:
對所受款待表示謝意的：
例句：
a bread-and-butter note.
一封感謝款待的短箋