To fill a hole or cavity, or block (an opening or passage), as with a plug.
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(UK, legal) To permanently close or block (a road or path); to legally extinguish a right of way.
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(photography) 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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Add your own interpretation of "stop up".
Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.