to stop up

listen to the pronunciation of to stop up
İngilizce - Türkçe
tıkanmak
tıka
tıkamak
geç yat
kapamak
İng. (belirli bir saate kadar) yatmamak
İngilizce - İngilizce
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.

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.

fill or close tightly with or as if with a plug; "plug the hole"; "stop up the leak"
to stop up