stop up

Meaning

  1. To fill a hole or cavity, or block (an opening or passage), as with a plug.
  2. To permanently close or block (a road or path); to legally extinguish a right of way.
  3. To increase the aperture of a photographic lens, moving from an f/stop represented by a higher number to an f/stop represented by a lower number and causing more light to pass into the camera.

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