noun
a person who walks or behaves in a very confident and typically arrogant or aggressive way
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The confident swaggerer walked into the boardroom with a sense of authority.
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That guy thinks he's such a swaggerer, strutting around like he owns the place.
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Check out that swaggerer, he's got all the moves on the dance floor.
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She carries herself like a swaggerer, exuding self-assurance in every step she takes.