FASTEN' FASTEN is a verb meaning to secure or join two or more objects together. It is often used in the context of attaching something to a wall or other surface, such as a picture frame or a piece of furniture. It can also be used to describe the act of joining two pieces of fabric together, such as sewing a button onto a shirt. FASTEN is also used to describe the act of connecting two pieces of metal together, such as when using a rivet or a bolt.