fasten

(verb) cause to be firmly attached. Synonyms: fix, secure. Examples: "Fasten the lock onto the door." "She fixed her gaze on the man."

(verb) become fixed or fastened. Example: "This dress fastens in the back."

(verb) attach to. Example: "They fastened various nicknames to each other."

(verb) make tight or tighter. Synonyms: tighten. Example: "Tighten the wire."