[1] : WordNet (r) 2.0

hinge upon
     v : be contingent on; "the outcomes rides on the results of the
         electin"; "your grade will depends on your homework"
         syn: depend on, devolve on, depend upon, ride, turn
         on, hinge on
see also:
depend on devolve on depend upon ride turn on hinge on 

Hinge >> H Words
Hinge, definition of term: Hinge
hinge_pag1.html

Upon >> U Words
Upon, definition of term: Upon
upon_pag1.html

Look Upon >> L Words
Look Upon, definition of term: Look Upon
look+upon_pag1.html

Call Upon >> C Words
Call Upon, definition of term: Call Upon
call+upon_pag1.html

Bear Upon >> B Words
Bear Upon, definition of term: Bear Upon
bear+upon_pag1.html

Agreed Upon >> A Words
Agreed Upon, definition of term: Agreed Upon
agreed+upon_pag1.html