your bread and butter

US /jʊər brɛd ænd ˈbʌtər/
UK /jʊər brɛd ænd ˈbʌtər/
"your bread and butter" picture
1.

mata pencarian, sumber penghasilan utama

a person's livelihood or main source of income

:
Teaching is her bread and butter, but she also writes novels in her free time.
Mengajar adalah mata pencahariannya, tetapi dia juga menulis novel di waktu luangnya.
For a journalist, breaking news is their bread and butter.
Bagi seorang jurnalis, berita terkini adalah mata pencarian mereka.