1.
to need or depend on sb/sth :
As babies, we rely entirely on others for food.
[+ to inf]
These days we rely heavily on computers to organize our work.
[+ -ing ]
The industry relies on the price of raw materials remaining low.
2.
to trust or have faith in sb/sth :
You should rely on your own judgement.
[+ to inf]
You can rely on me to keep your secret.
He can't be relied on to tell the truth.
➡ note at trust