depend upon in WordNet English dictionary

1. be contingent on
   "The outcomes rides on the results of the election"; "Your grade will depends on your homework"
   depend on  devolve on  depend upon  ride  turn on  hinge on  hinge upon 
   
2. put trust in with confidence
   "she is someone you can really rely on when times get rough"; "you can rely on his discretion"
   depend on  depend upon  rely on  rely upon