Definition

to know the ins and outs (of something): to know, to be acquainted with, to be familiar with the finer details, points, facts, particulars (of something) idiom
My father knows the ins and outs of the European constitution, he can say most of it from memory.
  • "It's clear that you have mastered the ins and outs of the British pub, so I don't think you'll experience any cultural problems. I was amazed when you stood on the table and sang Abba songs with members of a women's rugby team. While this kind of behaviour may not be acceptable in front of your client, I'm sure you'll go down well with English girls!"

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