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stopping down

Changing the lens apertureto a smaller opening; for example, from f/8 to f/11. Some lenses, like PC lens orattachment with a none dedicated bellow on macro photography, stop down exposuremetering is required for correct reading.

mirglossary

stopping down

the act of closing down the aperture to a smaller opening. EI going from f5.6 to f8.
digitalphotographyschoolspeekingphotography

stopping down

Changing the lens aperture to a smaller opening; for example, from f/8 to f/11.
kodakglosarry1999

stopping down

Decreasing the size of the lens opening (aperture); for example, from f/8 to f/11. This increases the depth of field in a photograph, but a longer exposure is required.
ephotozine