We found 2 dictionaries that define the word jumping-off places:

General (2 matching dictionaries)

1. jumping-off places: Merriam-Webster
2. jumping-off places, jumping-off places: Collins English Dictionary

(Note: See jumping-off_place as well.)

Definitions from Wiktionary (jumping-off place) ▸ noun:  Synonym of jumping-off point ▸ Also see jumping-off_place ▸ Words similar to jumping-off places ▸ Usage examples for jumping-off places ▸ Idioms related to jumping-off places ▸ Wikipedia articles (New!) ▸ Words that often appear near jumping-off places ▸ Rhymes of jumping-off places ▸ Invented words related to jumping-off places