Definition of "brag"

Caesar […] made not here his brag / Of "came", and "saw", and "overcame".

1611 April (first recorded performance), William Shakespeare, “The Tragedie of Cymbeline”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act III, scene i]

Beauty is Nature's brag.

1634 October 9 (first performance), [John Milton], edited by H[enry] Lawes, A Maske Presented at Ludlow Castle, 1634: […], London: […] [Augustine Matthews] for Hvmphrey Robinson, […], published 1637; reprinted as Comus: […] (Dodd, Mead & Company’s Facsimile Reprints of Rare Books; Literature Series; no. I), New York, N.Y.: Dodd, Mead & Company, 1903,

You could just use ordinary shop-bought kecap manis to marinade the meat, but making your own is easy, has a far more elegant fragrance and is, above all, such a great brag! Flavouring kecap manis is an intensely personal thing, so try this version now and next time cook the sauce down with crushed, split lemongrass and a shredded lime leaf.

2015 October 27, Matt Preston, The Simple Secrets to Cooking Everything Better‎, Plum, page 192

our mixed companies here, which, if they happen to rise above bragg and whist, infallibly stop short of every thing either pleasing or instructive

January 23 1752, Philip Stanhope, 4th Earl of Chesterfield, in Letters to His Son, published in 1774

Conceit, more rich in matter than in words, / Brags of his substance, not of ornament. / Nor shall Death brag thou wander'st in his shade

c. 1591–1595 (date written), William Shakespeare, “The Tragedie of Romeo and Ivliet”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act II, scene vi]

1633 (first performance), Ben Jonson, “A Tale of a Tub. A Comedy […]”, in The Works of Ben Jonson, […] (Third Folio), London: […] Thomas Hodgkin, for H[enry] Herringman, E. Brewster, T. Bassett, R[ichard] Chiswell, M. Wotton, G. Conyers, published 1692, (please specify the act number in uppercase Roman numerals, and the scene number in lowercase Roman numerals)

Seest how brag yond bullock beare […] his pricked eares?

1579, Immeritô [pseudonym; Edmund Spenser], “Februarie. Aegloga Secunda.”, in The Shepheardes Calender: […], London: […] Hugh Singleton, […]; reprinted as H[einrich] Oskar Sommer, editor, The Shepheardes Calender […], London: John C. Nimmo, […], 1890,