rivet

(noun) ornament consisting of a circular rounded protuberance (as on a vault or shield or belt). Synonyms: stud.

(noun) heavy pin having a head at one end and the other end being hammered flat after being passed through holes in the pieces that are fastened together.

(verb) direct one's attention on something. Synonyms: concentrate, focus, center, centre, pore. Example: "Please focus on your studies and not on your hobbies."

(verb) fasten with a rivet or rivets.

(verb) hold (someone's attention). Example: "The discovery of the skull riveted the paleontologists."