fasten in WordNet English dictionary

1. make tight or tighter
   "Tighten the wire"
   tighten  fasten 
   
2. become fixed or fastened
   "This dress fastens in the back"
   fasten 
   
3. cause to be firmly attached
   "fasten the lock onto the door"; "she fixed her gaze on the man"
   fasten  fix  secure 
   
4. attach to
   "They fastened various nicknames to each other"
   fasten