the world > animals > mammals > group Ungulata (hoofed) > group Ruminantia (sheep, goats, cows, etc.) > bos taurus or ox > [noun] > unbranded (2)
an unbranded cow; (slang) a person with a clean police record (see also quot. 1941).
an unbranded beast (cf. clean-skin n. at clean-, adj. adv.compounds); also attributive.