Buttonhole, e.g (4)
I believe the answer is:
slit
(Other definitions for slit that I've seen before include "Narrow straight cut or opening" , "Narrow aperture" , "Long narrow opening" , "Long straight cut" , "Long narrow cut" .)
I believe the answer is:
slit
(Other definitions for slit that I've seen before include "Narrow straight cut or opening" , "Narrow aperture" , "Long narrow opening" , "Long straight cut" , "Long narrow cut" .)