'depend upon' definitions:

verb

Be contingent on; "The outcomes rides on the results of the election"; "Your grade will depends on your homework" [syn: depend on, devolve on, depend upon, ride, turn on, hinge on, hinge upon]

verb

Put trust in with confidence; "she is someone you can really rely on when times get rough"; "you can rely on his discretion" [syn: depend on, depend upon, rely on, rely upon]