štěrbina znamená v angličtina

cleft [clefts]▼(opening made or as if made by splitting)
noun
[UK: kleft] [US: ˈkleft]

crack [cracks]▼(narrow opening)
noun
[UK: kræk] [US: ˈkræk]

slit [slits]▼(narrow cut or opening; a slot)
noun
[UK: slɪt] [US: sˈlɪt]