Not one or the other; not fitting any category. This term dates from the sixteenth century and appeared in John Heywood’s 1546 Proverbs as “She is nother fyshe, nor fleshe, nor good red hearyng [herring].” The analogy refers to food for monks (fish), for the people (meat), and for the poor (red herring). Shakespeare also used the term; when Falstaff insults Mistress Quickly, he says she’s an otter because “She’s neither fish nor flesh; a man knows not where to have her” (Henry IV, Part 1, 3.3).