n. phr. The special ways of going somewhere or doing something; the different parts. The janitor knows all the ins and outs of the big school building. Jerry's father is a good life insurance salesman; he knows all the ins and outs of the business.
INS AND OUTS
Meaning of INS AND OUTS in English
American idioms English vocabulary. Английский словарь американских идиом. 2012