upcurlingn.
Etymology: Previous versions of the OED give the stress as: upˈcurling.
the world > space > shape > curvature > types of curvature > [noun] > curled condition or formation > upwards
1828 II. 185 The up-curling of its widely-dilated nostrils.
This entry has not yet been fully updated (first published 1926; most recently modified version published online June 2019).