adj to cause to take close effect; to make to tell; to lay on; as, to fasten a blow.
2. fasten ·vi to fix one's self; to take firm hold; to clinch; to cling.
3. fasten ·adj to fix firmly; to make fast; to secure, as by a knot, lock, bolt, ·etc.; as, to fasten a chain to the feet; to fasten a door or window.
4. fasten ·adj to cause to hold together or to something else; to attach or unite firmly; to cause to cleave to something , or to cleave together, by any means; as, to fasten boards together with nails or cords; to fasten anything in our thoughts.