n (metal type) A blank metal block used to fill short lines of type.
n (printing|_|slang) A joke used to fill long days of setting type.
n (typography|phototypesetting and digital typesetting) A keyboard command which aligns text with the left or right margin, or centred between them. In combination, as quad left, quad right, or quad centre.
v (metal type|transitive|intransitive) To fill spaces in a line of type with quads. Also quad out.
v (context|typography|phototypesetting and digital typesetting|transitive|intransitive) To align text with the left or right margin, or centre it.