1 depend (on or upon). be contingent or dependent or conditional on, turn on, hinge on, pivot on, hang on, be subject to, rest on, be influenced or determined or conditioned by:
The plans for our picnic depend on the weather.
2 depend on or upon. trust (in), rely on, count on, reckon on, bank on, be sure of, put one's faith or trust in:
I knew we could depend on you, Giles, to do the right thing.