We've picked unfortunate name for it, I guess.
So simply, if you hold items under your finger, release them and grab again. The simpliest way is to do it in the same place on the screen, but if you like or if you need, you can throw items a little up or to the side and grab again. That's the "tossing". (of course, do it before the items hit the floor).
You can reset the time ring this way, so you'll be able to make more than 100x combos. That enables huge scores.
PS - in the update, there will be tutorial to explain this!