fastenfas‧ten /ˈfæsən/ ●●○ verb 
1
[intransitive, transitive] to join together the two sides of something so that it is closed, or to become joined ANT unfasten, undo: 
Fasten your seat belts. The skirt fastens at the back.THESAURUSattach – to join something firmly to another object or surface: A long lens was attached to the camera.secure formal – to fasten or tie something tightly in a particular position: “Please fasten your seatbelt and secure all loose objects,” said the flight attendant.join – to make things connectedglue – to join things together using gluetape – to fasten or attach something using tapestaple – to join things or attach something using staples (=small pieces of bent wire that go through paper)clip – to join things together using a clip (=small object that goes over paper to hold it together)tie – to fasten a tie or shoes, etc. by making a knot: Don’t forget to tie your shoelaces.button (up) – to fasten the buttons on a shirt, coat, etc.zip (up) – to fasten clothes, bags, etc. with a zipper (=two lines of small pieces of metal or plastic that slide together)2[transitive] to attach something firmly to another object or surface: Jill fastened a flower to/onto her dress.3[transitive] to firmly close and lock a window, gate, etc.
1 [intransitive, transitive] to join together the two sides of something so that it is closed, or to become joined ANT unfasten, undo: Fasten your seat belts. The skirt fastens at the back.THESAURUSattach – to join something firmly to another object or surface: A long lens was attached to the camera.secure formal – to fasten or tie something tightly in a particular position: “Please fasten your seatbelt and secure all loose objects,” said the flight attendant.join – to make things connectedglue – to join things together using gluetape – to fasten or attach something using tapestaple – to join things or attach something using staples (=small pieces of bent wire that go through paper)clip – to join things together using a clip (=small object that goes over paper to hold it together)tie – to fasten a tie or shoes, etc. by making a knot: Don’t forget to tie your shoelaces.button (up) – to fasten the buttons on a shirt, coat, etc.zip (up) – to fasten clothes, bags, etc. with a zipper (=two lines of small pieces of metal or plastic that slide together)2[transitive] to attach something firmly to another object or surface: Jill fastened a flower to/onto her dress.3[transitive] to firmly close and lock a window, gate, etc.
