cowslip: [OE] Old English cūslyppe literally meant ‘cow dung’ (a variant cūsloppe, which survived dialectally into the 20th century as cowslop, suggests that its second element is related to slop and sloppy). The name presumably came from the plant’s growing in pastures where cows commonly graze, and perhaps even from some perceived symbiosis with cow-pats. [cowslip etymology, cowslip origin, 英语词源]