The phrase "gentle swipe" means to lightly or softly move your hand or fingers across something, typically in a smooth or delicate manner. Full definition
I have no problem turning the pages with one hand, either with the backward and forward buttons; a small gentle swipe of the thumb will more than suffice. (goodereader.com)
So, a nice, gentle swipe of the device would suffice enough. (giantmommy.com)
As you'd expect, touch responsiveness is great, with gentle swipes allowing you to zip between screens and apps. (trustedreviews.com)