fasten
Definitions
To close or join securely by means of a fastener, such as a button, buckle, or lock.
To fix or attach something firmly in a particular place or position.
To direct one's eyes or attention intently toward something.
Examples
Please fasten your seatbelt before the airplane takes off.
You need to fasten the latch securely to keep the gate closed.
She helped the child fasten the buttons on his winter coat.