Origin: 1250–1300;Middle Englishbrayen < Old Frenchbraire to cry out (cognate with Medieval Latinbragīre to neigh) < Celtic; compare Old Irishbraigid (he) breaks wind
c.1300, from O.Fr. braire "to cry," from Gallo-Romance *bragire "to cry out," perhaps from a Celtic source (cf. Gael. braigh "to shriek, crackle"), probably imitative. As a noun, from c.1300. Related: Braying.