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Gadfly: noun -
horsefly, botfly, or other fly that bites and irritates cattle; someone
who gads about; someone who irritates or harasses others.
'Nina, a consummate rider,
was thrown from her horse when a gadfly bit him on his withers.'
'That bloody Nigel is a
proper gadfly; constantly dashing about the place and gossiping about everyone,
whether he knows them or not.'
