Boastful or arrogant behavior; the act or practice of bragging excessively.
From 'braggart' plus the suffix '-ry' meaning practice or behavior (similar to 'knavery' or 'trickery'). This creates a noun describing the quality of being boastful.
In medieval and Renaissance literature, 'braggartry' was a stock character trait—the braggart soldier who talked about his conquests was such a common joke that Shakespeare and Cervantes both mocked this type repeatedly.
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