know which side your bread is buttered on
US /noʊ wɪtʃ saɪd jʊər brɛd ɪz ˈbʌtərd ɑn/
UK /noʊ wɪtʃ saɪd jʊər brɛd ɪz ˈbʌtərd ɑn/

1.
يعرف من أين تأتيه الفائدة, يعرف مصلحته
to be aware of where your advantages or benefits come from and to act in a way that maintains them
:
•
He always helps his boss because he knows which side his bread is buttered on.
إنه دائمًا يساعد رئيسه لأنه يعرف من أين تأتيه الفائدة.
•
You need to know which side your bread is buttered on if you want to succeed in this company.
عليك أن تعرف من أين تأتيك الفائدة إذا أردت أن تنجح في هذه الشركة.