To turn or fold inwardly.
To fold inward to create a hollow space where none had existed, as with a gastrula forming from a blastula.
To fold up or enclose into a sheath-like or pouch-like structure, either naturally or as part of a surgical procedure.
Having one portion of a hollow organ drawn back within another portion.
sheathed
To give a new cant (slant, angle) to something, in particular railway track on a curve.
To withdraw or repudiate a statement or opinion formerly expressed, especially formally and publicly.