Definitions:
a folder or box for holding loose papers together and in order for easy reference

a number of issues and responsibilities relating to a particular policy area

place (a document) in a cabinet, box, or folder in a particular order

a line of people or things one behind another

(of a group of people) walk one behind the other, typically in an orderly and solemn manner

a tool with a roughened surface or surfaces, typically of steel, used for smoothing or shaping a hard material.

smooth or shape with a file

pounded or powdered sassafras leaves used to flavour and thicken soup, especially gumbo