stop up ( synonym found)
Definition of stop up:

°To fill a hole or cavity, or block an opening or passage, as with a plug.
°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.
Definition of stop up:

°To fill a hole or cavity, or block an opening or passage, as with a plug.
°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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