dây màu xanh
/ˌkɔːdɒ̃ ˈblɜː//ˌkɔːrdɔːn ˈblɜː/Word Originmid 18th cent. (as a noun, often specifically denoting a first-class cook): French, literally ‘blue ribbon’. The blue ribbon once signified the highest order of chivalry in the reign of the Bourbon kings.