zip / zipper
cerniere
cher-NYEH-rah
Also called 'zip' (borrowed from English). 'Aprire la cerniera' = to unzip. 'Chiudere la cerniera' = to zip up.
La cerniera del giubbotto si è rotta.
The zip of the jacket is broken.
Tira su la cerniera del cappotto.
Zip up the coat.