day trader
noun[C]
ukusSTOCK MARKET
apersonwhobuysandsellsshareson the sameday, often on theinternet,reactingtosmallchangesinpricesinorderto make aprofit:
Adaytradertriestolockinquickprofitsbybuyingorsellingastockin thehopeit willkeeprisingorfallinginvaluefor theminutesit isowned.