Noun

1. A piece of cloth covering a window to keep the sun from shining inside.
2. A similar piece of cloth that separates the audience and the stage in a theater.
3. The flat area of wall which connects two bastions or towers; the main area of a fortified wall.
   • 1603, John Florio, translating Michel de Montaigne, Essays, Folio Society 2006, vol. 1, p. 220:

     Captain Rense, beleagring the Citie of Errona for us, [...] caused a forcible mine to be wrought under a great curtine of the walles [...].