1. to climb (The thing you climb is the direct object. Sounds very "hands on". Not very common, but you can find it in mountaineering for climbing a mountain. NOT for small things like a table, for example.)
2. to get in/on (Sounds a bit stiff and formal or technical. Works for a throne for example.)
3. to mount, to bone (The sexual sense. Think of a bull getting on a cow from behind. The meaning is sexual but it doesn't sound sexy AT ALL.)