to take the veil
Webster's Dictionary (GCIDE)
Veil \Veil\ (v[=a]l), n. [OE. veile, OF. veile, F. voile, L. velum a sail, covering, curtain, veil, probably fr. vehere to bear, carry, and thus originally, that which bears the ship on. See Vehicle, and cf. Reveal.] [Written also vail.] [1913 Webster]
1.Something hung up, or spread out, to intercept the view, and hide an object; a cover; a curtain; esp., a screen, usually of gauze, crape, or similar diaphnous material, to hide or protect the face. [1913 Webster]
The veil of the temple was rent in twain.— Matt. xxvii. 51.[1913 Webster]
She, as a veil down to the slender waist, Her unadorn['e]d golden tresses wore.— Milton.[1913 Webster]
2.A cover; a disguise; a mask; a pretense. [1913 Webster]
[I will] pluck the borrowed veil of modesty from the so seeming Mistress Page.— Shak.[1913 Webster]
3.(Bot.) (a) The calyptra of mosses. (b) A membrane connecting the margin of the pileus of a mushroom with the stalk; -- called also velum. [1913 Webster]
4.(Eccl.) A covering for a person or thing; as, a nun's veil; a paten veil; an altar veil. [1913 Webster]
5.(Zool.) Same as Velum, 3. [1913 Webster]
To take the veil (Eccl.), to receive or be covered with, a veil, as a nun, in token of retirement from the world; to become a nun. [1913 Webster]