the nuts and bolts
US /ðə nʌts ənd boʊlts/
UK /ðə nʌts ənd boʊlts/
1.
the basic practical details of a subject or activity
:
•
Let's get down to the nuts and bolts of the project.
•
He understands the nuts and bolts of how a car works.
the basic practical details of a subject or activity