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English definition of “day trader”

day trader

noun [C]    
STOCK MARKET a person who buys and sells shares on the same day, often on the internet, reacting to small changes in prices in order to make a profit: A day trader tries to lock in quick profits by buying or selling a stock in the hope it will keep rising or falling in value for the minutes it is owned.
(Definition of day trader noun from the Cambridge Business English Dictionary © Cambridge University Press)
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