1. to have an incline (For streets or terrain for instance. NOT for something that stands at an incline. The core idea here is "sloping upward".)
Opposite (closest): abfallen
2. to increase, to rise (It has a more gradual vibe than just "steigen" and isn't used that much in this sense. One context would be rising sea level over multiple years or prices rising due to inflation. A simple "steigen" is more idiomatic in most contexts.)
Opposite (closest): abfallen