Wiktionary
upleap
vb. (context intransitive English) To leap up; spring up.
Usage examples of "upleap".
Kane clubbed his musket and smashed down into the red-eyed faces, knocking aside the upleaping hands.
His appearance was like the upleaping of a Jack-in-the-box at the touch of the spring, but the explanation was evident: he was making his way down the gorge from above, when his leap from one rock to another brought him thus abruptly into view.