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nuts and bolts

pl.n. Slang
The basic working components or practical aspects: "[proposing] lofty goals without specifying the nuts and bolts of how they are to be achieved" (Village Voice).

nuts′-and-bolts′ adj.


essential; practical
References in periodicals archive ?
For all the nuts-and-bolts topics the Durban workshops will cover, one of the most useful could be that on the moral foundations of self-governance.
Here's a nuts-and-bolts look at sockets, socket drivers and accessories.