Student or Learner
I'm very confused about the expression in red. I know the meaning of "off" in this sentence. It is the same as that in "They went off and left me alone." But what about "of" in this case? Thank you in advance for your help.
"While jumping off of any fixed point on the earth is very dangerous, diving from buildings poses the biggest risks for jumpers."
Yes, "jumping off of" and "jumping off" are the same thing. You might hear either one.
More rarely, you might hear "jumping off from" or "jumping from". It basically means the same thing, but implies that there is a destination. "He will be jumping off from the platform down to the net."
"He will jump from that building to the one across the alley!" implies that the person is going somewhere, rather than falling to the ground.