O que significa bolting up ?

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Wasting not a single second, she screamed and bolted the other way, trying to find any exit out of the building. She could hear Mayor Design screaming in the distance and, when she turned a corner, came to a screeching halt at the sight of not one, two, nor three, but five ponies blocking her escape route. Figuring that running back where she came from would be an unwise decision, she made for the nearest door, yanking it open, rushing inside the room, and then slamming it shut.

She pressed her body against it, breath ragged, until she deemed her magic strong enough to keep it shut while she looked for an exit—which, once again, was understandably hard when she turned around and found herself faced with roughly a dozen changelings sitting at a table, every single one bolting up.

“Oh dear,” she whispered, the door opening behind her as her magic faded out from shock. “This isn’t the little fillies’ room, is it?”