The idiom "nuts and bolts" originated from the world of machinery and construction, where nuts and bolts are essential components used to fasten and hold things together. "Nuts" are the threaded metal fasteners with a hole in the center, while "bolts" are the corresponding threaded rods with a head. Figuratively, this expression is used to refer to the practical and fundamental aspects or details of a subject or task. It implies focusing on the basic and essential elements necessary for understanding or accomplishing something.

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