The pop superstar testified for about an hour on Thursday, sometimes using unflinching language in giving her account of what happened.
The trial took place in Denver, Colorado after former radio DJ David Mueller sued the "Bad Blood" hit maker and her crew for up to $3 million in total damages, claiming that he lost his job because Swift personally orchestrated for him to be fired.
Mueller sued Swift after her team reported the alleged assault to his bosses at a country music station.
As Taylor Swift's assault trial continues, the singer is getting tons of support from her fellow celebrities.
U.S. District Judge William Martinez dismissed Muller's claim against Swift on Friday, claiming that he could not prove the pop star ruined his career over allegations that he groped her during a concert in 2013, reports E! Taylor Swift is claiming that Mueller grabbed her just beneath her skirt and one of her security guards witnessed it.
In a deposition past year, Swift said, "He reached up under my skirt and grabbed my ass right when I was having to pose for the photo, and it felt intentional that that would be the time he would choose to do it".
Her defiant, hour-long testimony came four days into a rapidly moving trial that is scheduled to last almost two weeks.