If you need to trim excess white space off a pdf document you can do this in Acrobat Pro.
Cropping refers to changing the x, the y, or both coordinates to make the page size smaller.
This is Preview > Tools > Crop.
Trimming refers to cutting down from a larger frame to the frame of the page.
This is ColorSync > Filters > PDF/X-3 > Add Trimbox if needed.
Scaling two up, four up, eight up or sixteen up with or without borders.
This is Preview > File > Print > roll down from Copies & Pages to Layout > Pages per Sheet, Layout Direction, Border.
Scaling a PDF can be done by placing the PDF page by page in another application, scaling the nested PDF to size using that applications scaling tools, and saving out as a second PDF from that application. Trouble is that colour compression may be applied twice and search support may be lost.
(Back to standard universal synonyms in Unicode/10646, yugh)