the.com/slit

a wound and a window — proof the smallest opening holds the most danger

means A long, narrow cut or opening, or the act of making one with a sharp edge.

from From Old English 'slitan,' to tear or cut, with cousins across the Germanic family — Old Norse 'slíta,' Old High German 'slizan' — all carrying the sense of rending or splitting apart. The deep ancestor is a Proto-Germanic root meaning 'to split,' and you can hear its violence preserved in the word still: it is a noun born from a verb that does damage.

linguistics
shares ancient roots with slice and split
physics
double-slit experiment proved light is both wave and particle
weaponry
medieval castles had arrow slits barely a hand wide
fashion
the thigh slit dates back centuries before red carpets
sewing
a slit pocket hides everything in plain sight
for instance

slit drum — wooden percussion instrument found in africa and asia, producing sound through a single lengthwise slit

slit lamp — ophthalmic microscope used since 1911 to examine the eye's anterior segment

slit trench — military fortification used in wwi and wwii as narrow defensive positions

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