Stop up

verb

Definitions

Verb
  1. 1
    To fill a hole or cavity, or block (an opening or passage), as with a plug.

    "So then we […] scratched around and found an old tin washpan, and stopped up the holes as well as we could."

  2. 2
    fill or close tightly with or as if with a plug wordnet
  3. 3
    To permanently close or block (a road or path); to legally extinguish a right of way. UK
  4. 4
    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.

    "To stop down means to narrow the aperture; to stop up or open up means to expand it."

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