To talk loudly about something you've done or own in order to make yourself look impressive.
Possibly from Old Norse 'bragr' meaning 'the best' or 'foremost,' though some scholars suggest it may be imitative of boastful speech sounds.
Studies show that bragging actually makes people like you less, yet humans across all cultures do it anyway—it's such a universal impulse that Shakespeare used it constantly in his plays to show character flaws.
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