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Stop up
Meaning
Verb
●
To
fill
a
hole
or
cavity
, or
block
(an
opening
or
passage
),
as with
a plug.
●
In British English & Law:
To
permanently
close
or
block
(
a road
or
path
); to
legally
extinguish
a right of way.
●
In 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.
Sourced from
Wiktionary
Antonyms
Stop Down
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