fasteningslit
nounUK /ˈfɑːsənɪŋ slɪt/
US /ˈfæsənɪŋ slɪt/
A fastening slit is a small cut or opening that helps something close or hold together.
The envelope had a fastening slit where you tuck the flap in.
SYNONYMS
OTHER MEANINGS
2. A narrow cut in fabric used to pass a button or strap through.
She sewed a fastening slit into the coat so the belt could go through.
3. A groove or notch that lets two parts lock together.
The wooden box had a fastening slit that held the lid snug.
4. An opening in paper or card that holds a tab in place.
The folder's fastening slit kept the papers from falling out.