day-trade

[dey-treyd]
verb (used without object), day-trad·ed, day-trad·ing.
  1. to buy and sell a listed security or commodity on the same day, usually on margin, for a quick profit.
Related formsday-trad·er, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for day trading

day trading

noun
  1. the practice of buying and selling shares on the same day, often via the internet, in order to make a quick profit
Derived Formsday trader, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012