1. To hop or leap off of something. The kids jumped off the platform and landed in the foam pit.
2. To begin or start. When does this party jump off? Am I early?
jump off (of something)
to leap off something. (Of is usually retained before pronouns.) Rachel lost her balance and jumped off the diving board instead of diving.Better to jump off than to fall off.
jump off
v.
1. To leap or bound off something: The parachuter jumped off the cliff.
2. To get started: The event jumped off at 3:00 this afternoon.