brag: [13] Brag first turned up in English as an adjective, meaning ‘spirited’ or ‘boastful’; the verb and noun did not appear until the 14th century. Where English got the word from, however, remains a mystery. French has braguer ‘brag’, but it is not clear whether English borrowed from French, or vice versa; French did, however, contribute the derivative bragard, which English adopted as braggart [16]. This probably also formed the basis of braggadocio, an Italianate coinage first used by the poet Edmund Spenser as a personification of ‘boastfulness’ in his Faerie Queene 1590.
