Meaning of the word "know which side your bread is buttered on" in English

What does "know which side your bread is buttered on" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

know which side your bread is buttered on

US /noʊ wɪtʃ saɪd jʊər brɛd ɪz ˈbʌtərd ɑn/
UK /nəʊ wɪtʃ saɪd jɔː brɛd ɪz ˈbʌtəd ɒn/
"know which side your bread is buttered on" picture

Idiom

to be aware of where your advantages or benefits come from and to act in a way that maintains them

Example:
He always helps his boss because he knows which side his bread is buttered on.
You need to know which side your bread is buttered on if you want to succeed in this company.